I'm getting a 'Failed to compile' error in React. What are the first steps I should take to troubleshoot?

A 'Failed to compile' error means there's a syntax error or other issue preventing your code from being bundled. First, carefully examine the error message in the console – it usually points to the file and line number with the problem. Common causes include: syntax errors (typos, missing semicolons), import errors (incorrect file paths), or issues with your build configuration (Webpack, Babel). Try clearing your cache and restarting your development server.