diff --git a/packages/react-native/ReactCommon/cxxreact/CxxNativeModule.cpp b/packages/react-native/ReactCommon/cxxreact/CxxNativeModule.cpp
index 3ca3d4bbdf9..d1450570488 100644
--- a/packages/react-native/ReactCommon/cxxreact/CxxNativeModule.cpp
+++ b/packages/react-native/ReactCommon/cxxreact/CxxNativeModule.cpp
@@ -94,6 +94,7 @@ std::vector<MethodDescriptor> CxxNativeModule::getMethods() {
   lazyInit();
 
   std::vector<MethodDescriptor> descs;
+  descs.reserve(methods_.size());
   for (auto& method : methods_) {
     descs.emplace_back(method.name, method.getType());
   }
@@ -198,7 +199,7 @@ void CxxNativeModule::invoke(
     TraceSection s(
         "CxxMethodCallDispatch", "module", moduleName, "method", method.name);
     try {
-      method.func(std::move(params), first, second);
+      method.func(params, first, second);
     } catch (const facebook::xplat::JsArgumentException& ex) {
       throw;
     } catch (std::exception& e) {
diff --git a/packages/react-native/ReactCommon/cxxreact/Instance.cpp b/packages/react-native/ReactCommon/cxxreact/Instance.cpp
index 3fda838887a..4e21dd70565 100644
--- a/packages/react-native/ReactCommon/cxxreact/Instance.cpp
+++ b/packages/react-native/ReactCommon/cxxreact/Instance.cpp
@@ -41,7 +41,7 @@ Instance::~Instance() {
 }
 
 void Instance::unregisterFromInspector() {
-  if (inspectorTarget_) {
+  if (inspectorTarget_ != nullptr) {
     assert(runtimeInspectorTarget_);
     inspectorTarget_->unregisterRuntime(*runtimeInspectorTarget_);
     assert(parentInspectorTarget_);
@@ -132,24 +132,28 @@ void Instance::initializeBridge(
 
 void Instance::loadBundle(
     std::unique_ptr<RAMBundleRegistry> bundleRegistry,
-    std::unique_ptr<const JSBigString> string,
+    std::unique_ptr<const JSBigString> startupScript,
     std::string sourceURL) {
   callback_->incrementPendingJSCalls();
   TraceSection s("Instance::loadBundle", "sourceURL", sourceURL);
   nativeToJsBridge_->loadBundle(
-      std::move(bundleRegistry), std::move(string), std::move(sourceURL));
+      std::move(bundleRegistry),
+      std::move(startupScript),
+      std::move(sourceURL));
 }
 
 void Instance::loadBundleSync(
     std::unique_ptr<RAMBundleRegistry> bundleRegistry,
-    std::unique_ptr<const JSBigString> string,
+    std::unique_ptr<const JSBigString> startupScript,
     std::string sourceURL) {
   std::unique_lock<std::mutex> lock(m_syncMutex);
   m_syncCV.wait(lock, [this] { return m_syncReady; });
 
   TraceSection s("Instance::loadBundleSync", "sourceURL", sourceURL);
   nativeToJsBridge_->loadBundleSync(
-      std::move(bundleRegistry), std::move(string), std::move(sourceURL));
+      std::move(bundleRegistry),
+      std::move(startupScript),
+      std::move(sourceURL));
 }
 
 void Instance::setSourceURL(std::string sourceURL) {
@@ -277,7 +281,7 @@ std::shared_ptr<CallInvoker> Instance::getJSCallInvoker() {
 RuntimeExecutor Instance::getRuntimeExecutor() {
   // HACK: RuntimeExecutor is not compatible with non-JSIExecutor, we return
   // a null callback, which the caller should handle.
-  if (!getJavaScriptContext()) {
+  if (getJavaScriptContext() == nullptr) {
     return nullptr;
   }
 
@@ -288,8 +292,8 @@ RuntimeExecutor Instance::getRuntimeExecutor() {
       strongNativeToJsBridge->runOnExecutorQueue(
           [callback = std::move(callback)](JSExecutor* executor) {
             // Assumes the underlying executor is a JSIExecutor
-            jsi::Runtime* runtime =
-                (jsi::Runtime*)executor->getJavaScriptContext();
+            auto* runtime =
+                static_cast<jsi::Runtime*>(executor->getJavaScriptContext());
             try {
               react_native_assert(runtime != nullptr);
               callback(*runtime);
@@ -315,7 +319,7 @@ void Instance::JSCallInvoker::setNativeToJsBridgeAndFlushCalls(
 
   m_shouldBuffer = false;
   m_nativeToJsBridge = nativeToJsBridge;
-  while (m_workBuffer.size() > 0) {
+  while (!m_workBuffer.empty()) {
     scheduleAsync(std::move(m_workBuffer.front()));
     m_workBuffer.pop_front();
   }
diff --git a/packages/react-native/ReactCommon/cxxreact/Instance.h b/packages/react-native/ReactCommon/cxxreact/Instance.h
index 9fe147c495e..145c2b63767 100644
--- a/packages/react-native/ReactCommon/cxxreact/Instance.h
+++ b/packages/react-native/ReactCommon/cxxreact/Instance.h
@@ -129,7 +129,7 @@ class RN_EXPORT Instance : private jsinspector_modern::InstanceTargetDelegate {
    * NativeMethodCallInvoker that schedules work on the respective thread.
    */
   std::shared_ptr<NativeMethodCallInvoker> getDecoratedNativeMethodCallInvoker(
-      std::shared_ptr<NativeMethodCallInvoker> nativeInvoker);
+      std::shared_ptr<NativeMethodCallInvoker> nativeMethodCallInvoker);
 
   /**
    * RuntimeExecutor is used by Fabric to access the jsi::Runtime.
diff --git a/packages/react-native/ReactCommon/cxxreact/JSBigString.cpp b/packages/react-native/ReactCommon/cxxreact/JSBigString.cpp
index 7883c1e7e2e..ea4116d0fdf 100644
--- a/packages/react-native/ReactCommon/cxxreact/JSBigString.cpp
+++ b/packages/react-native/ReactCommon/cxxreact/JSBigString.cpp
@@ -49,7 +49,7 @@ JSBigFileString::JSBigFileString(int fd, size_t size, off_t offset /*= 0*/)
 }
 
 JSBigFileString::~JSBigFileString() {
-  if (m_data) {
+  if (m_data != nullptr) {
     munmap((void*)m_data, m_size);
   }
   folly::fileops::close(m_fd);
@@ -59,7 +59,7 @@ const char* JSBigFileString::c_str() const {
   if (m_size == 0) {
     return "";
   }
-  if (!m_data) {
+  if (m_data == nullptr) {
     m_data = (const char*)mmap(
         nullptr, m_size, PROT_READ, MAP_PRIVATE, m_fd, m_mapOff);
     CHECK(m_data != MAP_FAILED)
diff --git a/packages/react-native/ReactCommon/cxxreact/JSIndexedRAMBundle.cpp b/packages/react-native/ReactCommon/cxxreact/JSIndexedRAMBundle.cpp
index 7b89fae0511..02b69c39fd5 100644
--- a/packages/react-native/ReactCommon/cxxreact/JSIndexedRAMBundle.cpp
+++ b/packages/react-native/ReactCommon/cxxreact/JSIndexedRAMBundle.cpp
@@ -11,6 +11,7 @@
 
 #include <glog/logging.h>
 #include <fstream>
+#include <memory>
 #include <sstream>
 
 #include <folly/lang/Bits.h>
@@ -70,8 +71,7 @@ void JSIndexedRAMBundle::init() {
   readBundle(reinterpret_cast<char*>(m_table.data.get()), m_table.byteLength());
 
   // read the startup code
-  m_startupCode = std::unique_ptr<JSBigBufferString>(
-      new JSBigBufferString{startupCodeSize - 1});
+  m_startupCode = std::make_unique<JSBigBufferString>(startupCodeSize - 1);
 
   readBundle(m_startupCode->data(), startupCodeSize - 1);
 }
@@ -95,7 +95,7 @@ std::string JSIndexedRAMBundle::getModuleCode(const uint32_t id) const {
 
   // entries without associated code have offset = 0 and length = 0
   const uint32_t length =
-      moduleData ? folly::Endian::little(moduleData->length) : 0;
+      moduleData != nullptr ? folly::Endian::little(moduleData->length) : 0;
   if (length == 0) {
     throw std::ios_base::failure(
         "Error loading module" + std::to_string(id) + "from RAM Bundle");
@@ -112,7 +112,7 @@ std::string JSIndexedRAMBundle::getModuleCode(const uint32_t id) const {
 void JSIndexedRAMBundle::readBundle(char* buffer, const std::streamsize bytes)
     const {
   if (!m_bundle->read(buffer, bytes)) {
-    if (m_bundle->rdstate() & std::ios::eofbit) {
+    if ((m_bundle->rdstate() & std::ios::eofbit) != 0) {
       throw std::ios_base::failure("Unexpected end of RAM Bundle file");
     }
     throw std::ios_base::failure(
diff --git a/packages/react-native/ReactCommon/cxxreact/JSIndexedRAMBundle.h b/packages/react-native/ReactCommon/cxxreact/JSIndexedRAMBundle.h
index 9a377b50d01..0bcb352c19c 100644
--- a/packages/react-native/ReactCommon/cxxreact/JSIndexedRAMBundle.h
+++ b/packages/react-native/ReactCommon/cxxreact/JSIndexedRAMBundle.h
@@ -29,7 +29,7 @@ class RN_EXPORT JSIndexedRAMBundle : public JSModulesUnbundle {
   buildFactory();
 
   // Throws std::runtime_error on failure.
-  JSIndexedRAMBundle(const char* sourceURL);
+  explicit JSIndexedRAMBundle(const char* sourcePath);
   JSIndexedRAMBundle(std::unique_ptr<const JSBigString> script);
 
   // Throws std::runtime_error on failure.
@@ -68,7 +68,7 @@ class RN_EXPORT JSIndexedRAMBundle : public JSModulesUnbundle {
 
   mutable std::unique_ptr<std::istream> m_bundle;
   ModuleTable m_table;
-  size_t m_baseOffset;
+  size_t m_baseOffset{};
   std::unique_ptr<JSBigBufferString> m_startupCode;
 };
 
diff --git a/packages/react-native/ReactCommon/cxxreact/MethodCall.h b/packages/react-native/ReactCommon/cxxreact/MethodCall.h
index f774463a069..b12fdde24c3 100644
--- a/packages/react-native/ReactCommon/cxxreact/MethodCall.h
+++ b/packages/react-native/ReactCommon/cxxreact/MethodCall.h
@@ -31,7 +31,7 @@ struct MethodCall {
 };
 
 /// \throws std::invalid_argument
-std::vector<MethodCall> parseMethodCalls(folly::dynamic&& calls);
+std::vector<MethodCall> parseMethodCalls(folly::dynamic&& jsonData);
 
 } // namespace facebook::react
 
diff --git a/packages/react-native/ReactCommon/cxxreact/ModuleRegistry.cpp b/packages/react-native/ReactCommon/cxxreact/ModuleRegistry.cpp
index 51a884321f7..15db7bad3cb 100644
--- a/packages/react-native/ReactCommon/cxxreact/ModuleRegistry.cpp
+++ b/packages/react-native/ReactCommon/cxxreact/ModuleRegistry.cpp
@@ -11,6 +11,7 @@
 
 #include <glog/logging.h>
 #include <reactperflogger/BridgeNativeModulePerfLogger.h>
+#include <utility>
 
 #include "NativeModule.h"
 #include "TraceSection.h"
@@ -37,7 +38,8 @@ std::string normalizeName(std::string name) {
 ModuleRegistry::ModuleRegistry(
     std::vector<std::unique_ptr<NativeModule>> modules,
     ModuleNotFoundCallback callback)
-    : modules_{std::move(modules)}, moduleNotFoundCallback_{callback} {}
+    : modules_{std::move(modules)},
+      moduleNotFoundCallback_{std::move(callback)} {}
 
 void ModuleRegistry::updateModuleNamesFromIndex(size_t index) {
   for (; index < modules_.size(); index++) {
diff --git a/packages/react-native/ReactCommon/cxxreact/ModuleRegistry.h b/packages/react-native/ReactCommon/cxxreact/ModuleRegistry.h
index bed262bc82e..e5146000b0d 100644
--- a/packages/react-native/ReactCommon/cxxreact/ModuleRegistry.h
+++ b/packages/react-native/ReactCommon/cxxreact/ModuleRegistry.h
@@ -58,12 +58,12 @@ class RN_EXPORT ModuleRegistry {
   MethodCallResult callSerializableNativeHook(
       unsigned int moduleId,
       unsigned int methodId,
-      folly::dynamic&& args);
+      folly::dynamic&& params);
 
   std::string getModuleName(unsigned int moduleId);
   std::string getModuleSyncMethodName(
       unsigned int moduleId,
-      unsigned int methodName);
+      unsigned int methodId);
 
  private:
   // This is always populated
@@ -71,7 +71,7 @@ class RN_EXPORT ModuleRegistry {
 
   // This is used to extend the population of modulesByName_ if registerModules
   // is called after moduleNames
-  void updateModuleNamesFromIndex(size_t size);
+  void updateModuleNamesFromIndex(size_t index);
 
   // This is only populated if moduleNames() is called.  Values are indices into
   // modules_.
diff --git a/packages/react-native/ReactCommon/cxxreact/NativeToJsBridge.cpp b/packages/react-native/ReactCommon/cxxreact/NativeToJsBridge.cpp
index 8afed017083..64539ee9274 100644
--- a/packages/react-native/ReactCommon/cxxreact/NativeToJsBridge.cpp
+++ b/packages/react-native/ReactCommon/cxxreact/NativeToJsBridge.cpp
@@ -26,6 +26,7 @@
 #include "TraceSection.h"
 
 #include <memory>
+#include <utility>
 
 #ifdef WITH_FBSYSTRACE
 #include <fbsystrace.h>
@@ -41,7 +42,7 @@ class JsToNativeBridge : public react::ExecutorDelegate {
   JsToNativeBridge(
       std::shared_ptr<ModuleRegistry> registry,
       std::shared_ptr<InstanceCallback> callback)
-      : m_registry(registry), m_callback(callback) {}
+      : m_registry(std::move(registry)), m_callback(std::move(callback)) {}
 
   std::shared_ptr<ModuleRegistry> getModuleRegistry() override {
     return m_registry;
diff --git a/packages/react-native/ReactCommon/cxxreact/NativeToJsBridge.h b/packages/react-native/ReactCommon/cxxreact/NativeToJsBridge.h
index f7b48ab61da..1e1de9bb56c 100644
--- a/packages/react-native/ReactCommon/cxxreact/NativeToJsBridge.h
+++ b/packages/react-native/ReactCommon/cxxreact/NativeToJsBridge.h
@@ -59,12 +59,12 @@ class NativeToJsBridge {
   void callFunction(
       std::string&& module,
       std::string&& method,
-      folly::dynamic&& args);
+      folly::dynamic&& arguments);
 
   /**
    * Invokes a callback with the cbID, and optional additional arguments in JS.
    */
-  void invokeCallback(double callbackId, folly::dynamic&& args);
+  void invokeCallback(double callbackId, folly::dynamic&& arguments);
 
   /**
    * Sets global variables in the JS Context.
@@ -78,11 +78,11 @@ class NativeToJsBridge {
    */
   void loadBundle(
       std::unique_ptr<RAMBundleRegistry> bundleRegistry,
-      std::unique_ptr<const JSBigString> startupCode,
+      std::unique_ptr<const JSBigString> startupScript,
       std::string sourceURL);
   void loadBundleSync(
       std::unique_ptr<RAMBundleRegistry> bundleRegistry,
-      std::unique_ptr<const JSBigString> startupCode,
+      std::unique_ptr<const JSBigString> startupScript,
       std::string sourceURL);
 
   void registerBundle(uint32_t bundleId, const std::string& bundlePath);
@@ -107,7 +107,7 @@ class NativeToJsBridge {
    * NativeModule thread(s).
    */
   std::shared_ptr<NativeMethodCallInvoker> getDecoratedNativeMethodCallInvoker(
-      std::shared_ptr<NativeMethodCallInvoker> nativeInvoker) const;
+      std::shared_ptr<NativeMethodCallInvoker> nativeMethodCallInvoker) const;
 
   jsinspector_modern::RuntimeTargetDelegate& getInspectorTargetDelegate();
 
diff --git a/packages/react-native/ReactCommon/cxxreact/ReactMarker.h b/packages/react-native/ReactCommon/cxxreact/ReactMarker.h
index c6729dd54bf..8b4a95234dc 100644
--- a/packages/react-native/ReactCommon/cxxreact/ReactMarker.h
+++ b/packages/react-native/ReactCommon/cxxreact/ReactMarker.h
@@ -76,7 +76,7 @@ class RN_EXPORT StartupLogger {
  public:
   static StartupLogger& getInstance();
 
-  void logStartupEvent(const ReactMarkerId markerName, double markerTime);
+  void logStartupEvent(const ReactMarkerId markerId, double markerTime);
   void reset();
   double getAppStartupStartTime();
   double getInitReactRuntimeStartTime();
diff --git a/packages/react-native/ReactCommon/cxxreact/tests/jsbigstring.cpp b/packages/react-native/ReactCommon/cxxreact/tests/jsbigstring.cpp
index 02890b11190..ac412042135 100644
--- a/packages/react-native/ReactCommon/cxxreact/tests/jsbigstring.cpp
+++ b/packages/react-native/ReactCommon/cxxreact/tests/jsbigstring.cpp
@@ -14,7 +14,7 @@
 using namespace facebook::react;
 
 namespace {
-int tempFileFromString(std::string contents) {
+int tempFileFromString(const std::string& contents) {
   const char* tmpDir = getenv("TMPDIR");
   if (tmpDir == nullptr) {
     tmpDir = "/tmp";
diff --git a/packages/react-native/ReactCommon/cxxreact/tests/methodcall.cpp b/packages/react-native/ReactCommon/cxxreact/tests/methodcall.cpp
index f124a2430c7..e418b384bce 100644
--- a/packages/react-native/ReactCommon/cxxreact/tests/methodcall.cpp
+++ b/packages/react-native/ReactCommon/cxxreact/tests/methodcall.cpp
@@ -106,8 +106,7 @@ TEST(parseMethodCalls, NullReturn) {
 }
 
 TEST(parseMethodCalls, MapReturn) {
-  auto jsText =
-      "[[0],[0],[[{\"foo\": \"hello\", \"bar\": 4.0, \"baz\": true}]]]";
+  auto jsText = R"([[0],[0],[[{"foo": "hello", "bar": 4.0, "baz": true}]]])";
   auto returnedCalls = parseMethodCalls(folly::parseJson(jsText));
   EXPECT_EQ(1, returnedCalls.size());
   auto returnedCall = returnedCalls[0];
diff --git a/packages/react-native/ReactCommon/jsitooling/react/runtime/JSRuntimeFactoryCAPI.cpp b/packages/react-native/ReactCommon/jsitooling/react/runtime/JSRuntimeFactoryCAPI.cpp
index 7f7d2e6d320..f362ac78d9f 100644
--- a/packages/react-native/ReactCommon/jsitooling/react/runtime/JSRuntimeFactoryCAPI.cpp
+++ b/packages/react-native/ReactCommon/jsitooling/react/runtime/JSRuntimeFactoryCAPI.cpp
@@ -9,7 +9,7 @@
 #include "JSRuntimeFactory.h"
 
 void js_runtime_factory_destroy(JSRuntimeFactoryRef factory) {
-  if (factory) {
+  if (factory != nullptr) {
     delete static_cast<facebook::react::JSRuntimeFactory*>(factory);
   }
 }
diff --git a/packages/react-native/ReactCommon/logger/react_native_log.h b/packages/react-native/ReactCommon/logger/react_native_log.h
index a05b4c6e6a3..3d26ea6b77f 100644
--- a/packages/react-native/ReactCommon/logger/react_native_log.h
+++ b/packages/react-native/ReactCommon/logger/react_native_log.h
@@ -21,13 +21,13 @@ extern "C" {
 #endif // __cplusplus
 void set_react_native_logfunc(reactnativelogfunctype newlogfunc);
 
-void react_native_log_info(const char* text);
-void react_native_log_warn(const char* text);
-void react_native_log_error(const char* text);
-void react_native_log_fatal(const char* text);
+void react_native_log_info(const char* message);
+void react_native_log_warn(const char* message);
+void react_native_log_error(const char* message);
+void react_native_log_fatal(const char* message);
 
-void _react_native_log(ReactNativeLogLevel level, const char* text);
-void _react_native_log_default(ReactNativeLogLevel level, const char* text);
+void _react_native_log(ReactNativeLogLevel level, const char* message);
+void _react_native_log_default(ReactNativeLogLevel level, const char* message);
 #ifdef __cplusplus
 }
 #endif // __cpusplus