At a minimum, see the water analogy halfway down this page:
»wiki.4hv.org/index.php/Basic_Ele ··· ctricity
A link is here:
»www.grmotorsports.com/news/01200 ··· lems.php
This one is a single page non-sales based general introduction.
There are a number of links at the bottom of this page:
»www.carcraft.com/howto/53318/ind ··· dex.html
The links describe scenarios, primarily using GM vehicles. The links are sponsored, and are written for a "muscle car" audience, so keep that in mind.
Attached below is a basic diagram that can be referred to when more specific questions are dealt with.
attachment is #983106