If you play jazz, then you play with your fingers. If you're playing rock, you use a pick. There's really no rhyme or reason to that other than that's just the way it has been.
You will have to experiment and try things out for yourself and you will not be sure of what you are doing. That's all right, you are feeling your way into the thing.
There is a real danger that computers will develop intelligence and take over. We urgently need to develop direct connections to the brain so that computers can add to human intelligence rather than be in opposition.