A person is not learning anything, if they acquire a dealer restored game. This is fine when a person has been in the hobby for ages and lack of time due to other time requirements, or even a rare game that is otherwise unobtainable.
Those advocators are enthusiasts with reduced motivation with wanting to play.
Do what most people did before the last iteration of 10+ year new collectors that decided to become owners..
Acquire a complete non-working EM game (find a local collector to help), and teach yourself electrical circuit theory.
Research proper solder techniques.
Watch my video regarding basic tools and equipment on Youtube, or others.
Find a local technician or collector to advise you to avoid common mistakes.
If you have questions, ask, don't guess.
Start practicing, and restore the game in question.
Not only will you be wiser, but it will help you not only troubleshoot your own game, and give yourself experience when you decide to buy more games potentially in the future.
If you are really serious acquire Randy Fromm's books. Restoring games is not easy, it is hard work with skills to do it right, as you don't want unreliable hacks.