Composer this, composer that. we need good basic tutorial..

Wouldnt it be great if you guys would put good basic tutorial togetherl about how to use install drupal with composer and modules
because I am touching the dark when as newbie when you install drupal on vps. what you exactly have to do.

Also the matter the fact on the frontage they don’t talk about the use off composer but still it’s much used tool for many modules

Drupal version: