go to your local wrecking yard or junkyard and pick up something that might be salvagable, something typical of the type of car you want to learn about. take it home and tear it apart bolt by bolt, then put it back together. Read and follow the manuals and you will learn a phenomenal amount...
you've got a lot of gears to work with. the left is the 'range' of gears, and the right is the gear selector
for the rear wheel. Total you have 21 different gear ratio options.
What they do for you is allow you to adjust the leverage your feet have to push the bike.
a 'high' gear will allow...
if the starter cranks the engine over quickly, then the problem is not likely the battery. If there is a delay between the time you hit the key and it starts cranking, then the starter relay may have a contact or ground issue, or the key switch may be getting flaky. You can test this by...