How do I make bone drivers work? I want to bend this character's arm bend, so I use some bones. But of course, there are always deformations. Well, apparently bone drivers are the answer.
But when I go and look at tutorials on it burns my brain cells very quickly.
If there is an alternative that works as good or better and is easier please tell me
There are alternatives, such as this, but you have to accept that rigging is a technical skill, so my advice is to let those brain cells burn, and ask here what exactly you don't understand.

Note that in 2.78 drivers were improved, but this means that older tutorials became a bit confusing.

Another alternative is to create only thin, skinny characters because they usually deform acceptably with correct weight painting, and the drivers are not needed.