ReactJS, a popular front-end JavaScript framework, simplifies web development but requires adherence to certain best practices to maintain application stability. To ensure a clean ReactJS app, developers should sanitize data before passing it as props to avoid runtime crashes and employ TypeScript to define clear data models. Testing is crucial, with a focus on critical paths and integration tests to identify how components interact. Error boundaries can catch and manage errors by displaying fallback UIs, while logging tools like loglevel-plugin-remote allow for effective monitoring and troubleshooting. Finally, a robust deployment strategy involving CI/CD tools and rollback capabilities is essential to ensure smooth application updates and operations. Following these practices helps maintain a stable, user-friendly, and scalable ReactJS application.