Where is a normal tutorial about Angular specifically about the server side?

Question

Angular

Interested in the moment as it generally works technologically.
All the videos I found are how to install and that's it ... What does it have to do with Windows. Nothing further is said. Like, here's the 3000th port for you - enjoy. (facepalm)
The rest of the videos and tutorials are how to code, which is not interesting at all.
We need explanatory material on how it works in principle, what is thrown where, how it is transmitted and returned.