I think that you will also be more successful operating when you continue to develop an understanding of the underlying physics and electrical engineering challenges. Btw, there are tons of excellent tutorials on Youtube.
If you have limited time or interest, I think what really helps are the following topics
- ohms law and multiple resistors in parallel / serial circuits
- understanding how capacitors and inductances behave with AC of different frequency
- this will naturally lead you to LC circuits, namely filters etc.
- impedance, reactance, reflections, SWR
- impedance matching circuits
- basics of antenna theory and practice
If you do not want to design or build your own gear, I think you can focus on the problems from the antenna output of your commercial gear to the end of the antenna. You will probably not need to understand how a superhet works or the various oscillator circuits.
But I bet ham radio and SOTA will be more successful and thus more rewarding if you understand why certain things will work and others don’t. This might take some time, but it is a very rewarding route. The only thing you need to avoid are the not-so-rare pieces of misinformation on the Internet. Stick with what can be traced back to high-school physics, and you will be on an excellent route.
73 de Martin, DK3IT