Q:

Ng server - Angular server ist not starting

I am trying to learn Angular from Youtube-Tutorial.  I installed Node. JS and Angular and already created a project.  I can open and edit the projects file.  But I can not start the server, if I am in the folder with the console and try "ng serve" or "ng serve --open", the console makes a line break and does something, but even after a long time waiting, nothing happens and I also can not reach the server under "localhost:4200"
I use Windows 10, ng version: 12.14.1 , npm version: 6.13.6, Angular version: 8.3.22
EDIT: 
It turns out that the server is starting, but it takes around 10-15 minutes for an empty project to be compiled and to be started.  I have a Intel Core i5 and 8GB of RAM. 

A:

Follow this guide and you should be good to go.  it could be that you did not install it globally try this command.  
npm install -g @angular/cli

