Vending machine electronics

Hy I am new here. If possible I would like to ask for your help. I need to understand basic electronics of vending machines.

Could you please tell me where should I start and what topics should I look into?

I am not looking to become an engineer, but I need to learn the basics to be able to comunicate with one.

Thanks for any help!

Here’s a bunch of PDF’s you can study:

http://www.monstervending.com/manuals.htm

I Would suggest Atlantis…as they are lead vending machine manufacturer.