Hi everyone. New to the forum and to mountain biking really. I got this bike from a friend and was curious if anyone could tell me anything about it? I can tell you the brakes don't work great and it doesn't shift through all the gears in the back Curious if it's worth putting time/money into and if anyone has any how-to videos or places to start on fixing the brakes and shifting. Not looking to do anything crazy but would like to be able to ride it around.