Hi!
First things need to do is:
1- Install NodeJs => https://nodejs.org/
2- Install npm globaly on your Os (windows - mac - ...)
npm i -g npm@6.14.3 update to latest version
3- Install nodemon for run-watching mode
(install command is : npm i -g nodemon )
I suggest to you install "nodemon" as globaly packages because it is a tool not a dependency for project
So now! you must install dependency packages: (please run below command in project folder)
npm i
Welldone! app is ready to run now. run below command
nodemon index.js
tadaaa!
open browser: "localhost:5000" (must see hello :))
open browser: "localhost:5000/api/courses" (must see course array list)
You can use Postman to Get,Post,Put,Delete Courses operators
Enjoyed.