I've been reading a lot of tutorials on how to use a multimeter, even a very good instructional video. I learn to do things like measuring current, restistance, voltage, etc. Since I want to make fancy custom arcade sticks I need to learn how to do find out things with a multimeter, but I can't figure out how to do it with generic tutorials I've found online.
But I want to do stuff like finding a VCC pin on a controller circuit for a power source to power another LED controller chip, finding a ground pin on a controller PCB and making sure I won't short out my console when plugging in a modified PCB in a controller.
So can anyone find information on how to find a VCC pin on a board, similarly a grounding in and how to check if im not shorting anything out after I've altered it?