Why does a generator need a capacitor?

Question

Electronics

Brothers, by God, advise a good article or a book about capacitors, until I started cutting my veins, I was generally lost in the sense of their purpose.
Here is a capacitor connected to a constant plus, it charges once and that's it, it no longer conducts current, right?
So how is he doing something here?
In other circuits, I also noticed that they are shoved a lot in pairs, despite the fact that in those places the circuit is always closed without a hint of opening. (Especially popular at the beginning of the circuit immediately between the plus and minus terminals, why?)

Answer 1

Capacitor. Handbook for preschool educational...