Getting Started with Next.js 14: A Practical Guide

Next.js 14 isn't a revolution — it's a careful refinement of everything Next 13 introduced. If you've been waiting to migrate, now is a good moment. Here's what actually matters in practice.

The App Router, finally stable#

The App Router lives in app/. Each folder is a route, and page.tsx is what renders. The big shift: components are Server Components by default.

// app/posts/page.tsx
import { db } from '@/lib/db'
 
export default async function Posts() {
  const posts = await db.post.findMany()
  return (
    <ul>
      {posts.map((p) => (
        <li key={p.id}>{p.title}</li>
      ))}
    </ul>
  )
}

No getServerSideProps. No useEffect. You await directly inside the component. This is the core mental model — embrace it.

Server Components vs Client Components#

Anything that uses state, effects, or browser APIs needs 'use client' at the top:

'use client'
import { useState } from 'react'
 
export function Counter() {
  const [n, setN] = useState(0)
  return <button onClick={() => setN(n + 1)}>{n}</button>
}

The trick is to keep client components small and push them to the leaves of your tree. Fetch data on the server; hand props down.

Partial Prerendering (PPR)#

PPR is the headline feature. It lets you statically render the shell of a page while streaming dynamic parts in. You write one page; Next decides what's static and what isn't.

import { Suspense } from 'react'
 
export default function Page() {
  return (
    <>
      <StaticHeader />
      <Suspense fallback={<Skeleton />}>
        <DynamicCart /> {/* streams in */}
      </Suspense>
    </>
  )
}

The result: a fast first paint plus dynamic data. You don't pick between SSG and SSR anymore.

Should you migrate?#

If you're on Pages Router with a working app — no rush. If you're starting fresh, App Router is the path forward. Either way, learn Server Components. They're the future of React itself, not just Next.

That's the practical core. The rest is detail you'll learn as you build.