I’ve been repairing electronics most of my life… as a child my father was in the service industry (repairing photo copiers) and he showed me how to take apart my toys and also how to solder at a very young age. From this point on I simply began repairing various items from TV’s to CD Players to video game consoles etc… from my findings, most electronics tend to have broken solder joints, blown caps or burnt resistors which means most electronics I attempt to repair are often saved… However there is one thing I lack and that is understanding the actual mathematical part of electronics - how each components value effects other components.

If I could learn this with the skills I already have I’m sure I could become an expert tech. and if I attended some school they do no teach how I learn. I learn with actual hands on.
For example in high school I took an electronics class multiple times, in that class they taught the basics “ERI / VRI” etc but I could not grasp most of it because it was just memorizing words and not memorizing something real world to these concepts… for example: I did a project in that class which was a VU meter for audio… it had capacitors listed on the schematics which I used and I decided to change them out for various value capacitors, and noticed the peaks fall off was altered.
I had no way to store what all the values mean unless I know what effect it has in real world - like on a VU meter. Thus I learned changing the uf changed the VU meter fall off time. And there for I was able to understand in part how a capacitor stores up a charge and discharges it.