Is there one place in specific you could learn soldering from, if you don't have a physical class or place to go to and learn, what would it be? youtube? here on GH? any advice on where to start from scratch?
I don't think that they would have a class on soldering seeing as it's quite simple in terms of why it works.
The solder itself is conductive and pretty much liquid wiring until cooled down which then connects the two wires, or the switch to the pcb.
You hold the solder at pcb point to melt it and join the two points you need, think of it like a line of electricity, but in the end it needs to go in a circle.
Basically a liquid wire, that allows the circuit to be completed, you need to control the speed or else you might burn something, or the solder is impure if not completely melted.
Completing the circuit :x.