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Installing Next.js — Complete Guide

Installing 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 2 of 100

Installing Next.js

Beginner → Intermediate → Advanced → Professional

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

Introduction

This lesson is part of the beginner section. We explain Installing Next.js slowly, with examples you can copy and run. If something is unclear, read it twice — that is how everyone learns. You install Next.js by running create-next-app, which scaffolds a TypeScript project with App Router, ESLint, and Tailwind optional. npm install downloads dependencies; npm run dev starts the local dev server on port 3000. Interviewers say "clone the repo and npm run dev" on day one. If Node or the scaffold fails, nothing else in LearnHub works.

Installing Next.js is setup knowledge. Without it, LearnHub will not run. Spend time here until npm run dev works without errors.

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: ShopNest storefront

The E-commerce team building ShopNest storefront uses Installing Next.js to scaffold the LearnHub app with TypeScript and App Router in one command. customers and admins never see the TypeScript files — they just get a fast, reliable product pages, cart, and checkout flow.

Production-style code

npx create-next-app@latest learnhub
# Choose: TypeScript Yes, ESLint Yes, Tailwind Yes,
# src/ No, App Router Yes, import alias @/* Yes

cd learnhub
npm run dev
# Open http://localhost:3000

What happens in production: In ShopNest storefront, a solid Installing Next.js foundation lets the team ship product pages, cart, and checkout flow 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.

npx create-next-app@latest learnhub
# Choose: TypeScript Yes, ESLint Yes, Tailwind Yes,
# src/ No, App Router Yes, import alias @/* Yes

cd learnhub
npm run dev
# Open http://localhost:3000

Line-by-line walkthrough

CodeWhat it means
npx create-next-app@latest learnhubPart of the Installing Next.js example — read it together with the lines before and after.
# Choose: TypeScript Yes, ESLint Yes, Tailwind Yes,Comment — notes for humans; the compiler ignores it.
# src/ No, App Router Yes, import alias @/* YesComment — notes for humans; the compiler ignores it.
cd learnhubPart of the Installing Next.js example — read it together with the lines before and after.
npm run devPart of the Installing Next.js example — read it together with the lines before and after.
# Open http://localhost:3000Comment — notes for humans; the compiler ignores it.

How it works (big picture)

  • create-next-app copies the official template.
  • npm run dev watches files and hot-reloads the browser.
  • The first page is app/page.tsx.

Do this on your computer

  1. Run npx create-next-app@latest learnhub with options above
  2. cd learnhub
  3. Run npm run dev
  4. Open http://localhost:3000 and see the default page
  5. Edit app/page.tsx heading to "LearnHub" and save — watch it update
  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

create-next-app scaffolds the project. npm run dev is your daily command. Use TypeScript and App Router for LearnHub.

Common questions

pnpm or yarn instead of npm?

All work — npm is fine for learning. Use what your team standardizes on.

Port 3000 already in use?

Stop the other process or run npm run dev -- -p 3001

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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