Head on over to https://nodejs.org/en/ and install Node JS.
Head over to https://www.npmjs.com/get-npm to install NPM.
Create a folder where you want your app to be stored on your local computer (either using a terminal or clicking using the standard operating system user interface).
Now you will need the terminal. Open up the terminal and navigate to the folder you created.
Common commands:
ls
- lists the files and folders inside of your current directorycd <folder name>
- change folders to folder name specifiedcd ..
- move up one folder
While in the terminal (and in your folder), install NextJS using npm install --save next react react-dom
Proper YAML formatting