A Basic Introduction to Next.js

Next.js is a React framework for building modern web applications that are fast, scalable, and production-ready. It’s widely used because it adds practical features on top of React—like routing, server rendering, and performance optimizations—without forcing you to assemble everything yourself. Next.js creates routes based on your project structure. Instead of manually wiring a router, you place pages (or route segments) in specific folders and Next.js handles the rest. Next.js supports multiple rendering strategies: Static Site Generation (SSG): pages are built ahead of time (fast, cacheable). Server-Side Rendering (SSR): pages are rendered on demand per request. Incremental Static Regeneration (ISR): static pages can be updated in the background on a schedule. This flexibility is useful because not every page in an app needs the same approach. Next.js lets you run backend logic alongside your frontend. Depending on your setup, you can use API routes or server functions to handle tasks like form submissions, authentication callbacks, or talking to a database—without maintaining a separate server. Next.js includes optimizations that typically require manual work: Automatic code splitting Image optimization Font optimization Bundling and caching improvements This results in faster load times and better Core Web Vitals with less effort. Modern Next.js projects often use the App Router (app/ directory). It introduces: Server Components by default (rendered on the server) Client Components when you need browser interactivity ("use client") Nested layouts and route segments Built-in loading and error handling patterns In practice, it helps you keep heavy work on the server while still using React for interactive UI where needed. A simple Next.js app often looks like this: app/ — pages, layouts, and routes components/ — reusable UI components lib/ — shared helpers (fetching, auth, db) public/ — static files (images, icons) This structure scales well as your app grows.