Next.js Tutorial
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Tutorials Next.js Tutorial

Introduction to Next.js — Complete Guide

Introduction to Next.js — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of Next.js Tutorial on Toolliyo Academy.

8 min read Updated 6/25/2026
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Next.js Tutorial (LearnHub) · Lesson 1 of 100

Introduction to Next.js

Beginner → Intermediate → Advanced → Professional

Beginner · 1 — Foundations · ~12 min read · Module 1: Next.js Foundations

Introduction

Welcome! This Next.js course starts from zero and goes all the way to professional level. You will build LearnHub — a Toolliyo-style LMS frontend — step by step. We explain things the way a friend would. Take your time with each lesson. Next.js is a React framework for building fast websites and web apps. It adds file-based routing, server rendering, image optimization, and API routes on top of React. You still write components in TypeScript — Next.js handles bundling, splitting, and deployment tooling. Imagine LearnHub serving thousands of students during exam week. Pages must load quickly on mobile, rank on Google, and feel snappy when switching lessons. Plain React alone needs manual setup for routing and SEO. Next.js gives you App Router, Server Components, and production defaults out of the box.

Throughout this course you build LearnHub — a Toolliyo-style LMS with course catalog, lesson player, dashboard, and auth. Requests flow: Browser → Next.js server → Server Component or API → data → HTML/JSON → Browser. This lesson is your map; the next 99 lessons go deep on each piece.

When will you use this?

You need this before writing any Next.js code — same as installing Node.js before opening a project.

  • Every React/Next.js job expects you to run npx create-next-app and npm run dev on day one.
  • Interviewers often ask you to explain the App Router folder structure and Server vs Client Components.

Real-world: LearnHub LMS

The EdTech / LMS team building LearnHub LMS uses Introduction to Next.js to ship fast, SEO-friendly React pages without configuring webpack and routing by hand. students and instructors never see the TypeScript files — they just get a fast, reliable course catalog, lesson player, and progress tracking.

Production-style code

// LearnHub — app/page.tsx (App Router)
export default function HomePage() {
  return (
    <main>
      <h1>LearnHub</h1>
      <p>Your courses, one click away.</p>
    </main>
  );
}

What happens in production: In LearnHub LMS, a solid Introduction to Next.js foundation lets the team ship course catalog, lesson player, and progress tracking on schedule without toolchain surprises.

Lesson example (start here)

Copy this smaller example first. Once it works, compare it with the real-world code above.

// app/page.tsx — LearnHub home
export default function HomePage() {
  return (
    <main>
      <h1>LearnHub</h1>
      <p>Learn Next.js by building a real LMS frontend.</p>
    </main>
  );
}

Line-by-line walkthrough

CodeWhat it means
// app/page.tsx — LearnHub homeComment — notes for humans; the compiler ignores it.
export default function HomePage() {Default export — the main page or component this file provides to Next.js.
return (Returns JSX — what the user sees in the browser.
<main>Part of the Introduction to Next.js example — read it together with the lines before and after.
<h1>LearnHub</h1>Part of the Introduction to Next.js example — read it together with the lines before and after.
<p>Learn Next.js by building a real LMS frontend.</p>Part of the Introduction to Next.js example — read it together with the lines before and after.
</main>Part of the Introduction to Next.js example — read it together with the lines before and after.
);Part of the Introduction to Next.js example — read it together with the lines before and after.
}Closes a block started by { above.

How it works (big picture)

  • app/page.tsx is the home route (/).
  • export default function defines the page component.
  • Next.js compiles this to HTML on the server so students see content fast.
  • No router config file — the folder name is the URL.

Do this on your computer

  1. Install Node.js 20 LTS from https://nodejs.org
  2. Run node --version and npm --version to confirm
  3. In the next lesson you will run npx create-next-app@latest learnhub
  4. Skim the App Router docs mentally — you will use app/ not pages/
  5. Bookmark the LearnHub repo folder you will create
  6. Read the real-world section and name which part of LearnHub uses this topic.
  7. Run the example locally with npm run dev and confirm the same behavior.
  8. Change one value in the example (route, text, or course id) and predict what will happen before you save.

Experiments — try changing this

  • Change a string or route in the example and save — watch the browser update.
  • Break the code on purpose (remove a bracket), read the error overlay, then fix it.

Remember

Next.js = React + routing + server rendering + production tooling. LearnHub is the project thread for all 100 lessons. App Router uses the app/ directory for routes and layouts. Server Components run on the server by default in App Router.

Common questions

Do I need to know React first?

Yes — basic components, props, and hooks help. Our React tutorial on Toolliyo is a good companion.

Next.js vs React?

React is the UI library. Next.js is the framework that structures routing, data loading, and deploy for React apps.

App Router vs Pages Router?

This course uses App Router (app/). Pages Router (pages/) is older; new projects should use App Router.

Is Next.js free?

Yes — open source. Vercel hosting has a generous free tier for demos.

Next.js Tutorial
Course syllabus
Start Here Next.js Complete Beginner's Guide
Module 1: Next.js Foundations Introduction to Next.js — Complete Guide Installing Next.js — Complete Guide Understanding Project Structure — Complete Guide App Router Basics — Complete Guide Pages and Layouts — Complete Guide React Components in Next.js — Complete Guide Client Components — Complete Guide Server Components — Complete Guide Routing Fundamentals — Complete Guide Dynamic Routing — Complete Guide
Module 2: Layouts & Styling Nested Layouts — Complete Guide Navigation and Linking — Complete Guide Static Assets — Complete Guide CSS Modules — Complete Guide Tailwind CSS in Next.js — Complete Guide Data Fetching — Complete Guide Server Actions — Complete Guide Forms in Next.js — Complete Guide Form Validation — Complete Guide Authentication Basics — Complete Guide
Module 3: Data & Forms Middleware — Complete Guide API Route Handlers — Complete Guide Database Integration — Complete Guide File Upload — Complete Guide Image Optimization — Complete Guide Metadata and SEO — Complete Guide Performance Optimization — Complete Guide Deployment — Complete Guide E-Commerce App Project — Complete Guide SaaS Dashboard Project — Complete Guide
Module 4: Auth & APIs SSR vs SSG vs ISR — Complete Guide Streaming and Suspense — Complete Guide Loading and Error UI — Complete Guide Route Groups — Complete Guide Parallel Routes — Complete Guide Intercepting Routes — Complete Guide Edge Runtime — Complete Guide Caching in Next.js — Complete Guide Revalidating Data — Complete Guide TanStack Query in Next.js — Complete Guide
Module 5: SEO & Deploy NextAuth.js — Complete Guide Clerk Authentication — Complete Guide OAuth and Social Login — Complete Guide Protected Routes — Complete Guide Prisma ORM — Complete Guide MongoDB with Next.js — Complete Guide PostgreSQL with Next.js — Complete Guide Environment Variables — Complete Guide Unit Testing — Complete Guide Integration Testing — Complete Guide
Module 6: Advanced Routing Playwright E2E — Complete Guide CI/CD for Next.js — Complete Guide Internationalization — Complete Guide Accessibility — Complete Guide XSS and CSRF Protection — Complete Guide Security Headers — Complete Guide Rate Limiting — Complete Guide Structured Data — Complete Guide Sitemap and Robots — Complete Guide Zustand State — Complete Guide
Module 7: Auth & Database Redux Toolkit in Next.js — Complete Guide React Context Patterns — Complete Guide Monorepo with Turborepo — Complete Guide Docker for Next.js — Complete Guide Vercel Deployment — Complete Guide AWS Amplify — Complete Guide Azure Static Web Apps — Complete Guide Micro Frontends — Complete Guide Remix vs Next.js — Complete Guide Web Vitals Tuning — Complete Guide
Module 8: Quality & Security Font Optimization — Complete Guide Bundle Analysis — Complete Guide Blog Application Project — Complete Guide Student Portal Project — Complete Guide Job Portal Project — Complete Guide Hospital Portal Project — Complete Guide Food Delivery Frontend Project — Complete Guide Banking Dashboard Project — Complete Guide LMS Course Player Project — Complete Guide CRM Admin Project — Complete Guide
Module 9: Cloud & Scale Real-Time Chat Project — LearnHub Project Multi-Tenant SaaS Project — LearnHub Project Inventory Dashboard Project — LearnHub Project Travel Booking Project — LearnHub Project News Portal Project — LearnHub Project Portfolio Site Project — LearnHub Project Enterprise Architecture — LearnHub Project Clean Folder Structure — LearnHub Project API Design Patterns — LearnHub Project Error Handling Patterns — LearnHub Project
Module 10: Portfolio Projects Logging and Monitoring — LearnHub Project Stripe Payments — LearnHub Project Analytics and Observability — LearnHub Project Storybook with Next.js — LearnHub Project GraphQL with Next.js — LearnHub Project Content Security Policy — LearnHub Project Partial Prerendering — LearnHub Project Server Actions Security — LearnHub Project Production Checklist — LearnHub Project Next.js Career Roadmap — LearnHub Project
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