Introduction/API Reference/File-system conventionsFile-system conventionsinstrumentation.jsAPI reference for the instrumentation.js file.publicNext.js allows you to serve static files, like images, in the public directory. You can learn how it works here.src DirectorySave pages under the `src` folder as an alternative to the root `pages` directory.ScriptOptimize third-party scripts in your Next.js application using the built-in `next/script` Component.instrumentation.jsAPI reference for the instrumentation.js file.