best way and fastest way to save money?

i have a part-time job with HEB, a grocery store.
making 7.50 an hour.
saving money for college life (college, moving out, car, etc.)
whats the best way to save money?
I know one way is to bring lunch and not buy, but what other ways can I save? I have a 10% discount on store brand foods so that saves me money from my job.

any other ways? and after i pay for my auto insurance, what percent of my paycheck should go to savings?

try to put back 10 percent of what you make that is what most people try to do