[hospitalJail]

Idk, I needed to understand resistors just to power an LED. As soon as you have any raw signal, you basically need a cap to smooth the signal.

I havent had a reason to use my own inductor myself, but obviously plenty of components have them.

Def has digital logic, registers are a clear example of this, especially if you are going to use an esp8266 which has only a few GPIO. There have also been cases when I needed to buy and/or/not gates, but they come as ICs with the caps inside for you.

I feel like making your own logic gates is reinventing the wheel(as the link that we are commenting on suggests). Even in school, doing EE, we only spent a blip on Assembly. I spent way more time doing higher level C/C++ stuff.