SHELL

command not found: create-next-app

// 1st step
npm install react next react-router
// 2nd step
npm i create-next-app
// final step
npx create-next-app my-awesome-app

command not found: create-next-app

Before create it manuely with

npm install react next react-router
Try to install the create-next-app package

npm i create-next-app
Then you can do again:

npx create-next-app my-awesome-app