[Dragonfly DIY] Good tutorials

I decided it would be useful to try to assemble a list of good tutorials here. These will probably be mostly or completely in YouTube. I will update this list as I find new stuff.

There is no limitation of what these will be about. I will try to categorize them but they may be anything from programming to arc welding. Basically whenever I watch a tutorial and decide it's good, I'll put it here.

Electromechanical:

Brushless DC motors (and motors in general)

Lab development and test equipment:

Using a bench power supply