Not to offend you sir but I think the first step on your journey and it would be the best move is to learn electronics first, because isolating BOB`s consist of opto isolators, a couple of signal diodes, some resistors, transistor drivers, and some relays, if you do a shortcut there might be some unpredictable things to happen and it might be more costly, things like a burned laptop USB ports, brick BOB`s, etc