“electronic design is just intuition!” — Someone, not answering your question
Here are some useful videos that may help in deepening your understanding of electrical and PCB design. Don’t treat this as a to-do list, since there are days worth of content in here. Instead, peruse through, and use what feels relevant at any given time. Good luck!
Feel free to add any useful resource that you find too!
Especially his PCB Design videos
PCB design
More EM stuff, PCB design
Excellent source for digital design
His breadboard computer is a classic (and super fun to build if you have time!)
The Ben Eater of analog audio
Tons of RF and instrumentation teardowns, repairs, and explainers