Hi,
Learning is always about embracing features you don't seem to need or want at the time, but it's nonetheless necessary to get an overview. you then extrapolate on what was done in a specific tutorial and apply it to your case, it's critical to absorb as much as possible, it will become useful eventually, it's guaranteed.
Don't hesitate to ask on this forum, make new posts for each of your questions, for example you seem to want to use the accelerometer, make a post, ping me and I'll reply.
Bye,
Jean