Implementing the Harness React SDK allows developers to easily incorporate feature flags into React applications, enabling dynamic UI changes without a full redeploy by leveraging feature toggle states. The article provides a straightforward guide on setting up and using the SDK, highlighting the integration process with core code examples. Essential requirements include having Node.js v12 or newer and React.js v16.7 or newer, with Vite recommended for project setup due to its enhanced features and performance. The implementation involves modifying two files: `App.jsx` for importing components such as `FFContextProvider` and `Logo.jsx` for utilizing the `useFeatureFlag` hook to conditionally render UI elements based on feature flag states set in the Harness UI. The guide concludes with successfully integrating the React SDK to enable feature flags in a core UI component, offering a practical starting point for developers exploring feature flagging with Harness.