How to create-next-app using version 12 instead of version 13

I am going to follow a new course in udemy and it is about creating a website with react. https://www.udemy.com/course/build-the-best-ecommerce-website-ever-with-react-js-next-js/ that is the course. The problem is, instructor is using Next.js version 12 and when I create a next.js now it will create with 13.1 version but there is drastic differences. How can I overcome this ? and is it possible to use yarn while doing it from terminal.

I looked to documentation but couldn't find a guide about this and I thought that just doing it from package.json would create problems later so I don't know what to do .

Use the following commands (taken from here):

<!-- language: bash -->
npx create-next-app@12 <app-name> && cd <app-name> && npm i next@12

It's possible to setup Next.js version 12 manually:

# init the package.json
npm init

# intall next dependencies
npm install next@12.3.4 react react-dom

// edit your package.json with next scripts
"scripts": {
  "dev": "next dev",
  "build": "next build",
  "start": "next start",
  "lint": "next lint"
}

# create the file structure
.
├── package.json
├── pages
│   ├── index.js

// init your index.js
import React from "react";
function index() {
  return <div>Hello world</div>;
}
export default index;

# start next
npm run dev

npx create-next-app@12 .
for now is the only solution but indirectly it already uses YARN under the hood