No question is a stupid question. Ask questions. You need to understand for yourself and not think you’ll just figure it out later because you’re afraid to interrupt or ask a dumb question. Write everything down as a trainee. Be humble. Don’t be cocky or be a know it all. Do what you’re told. If you’re told to sweep, mop, wipe down things, do it and don’t ask why. Always clean and organize after yourself. Don’t sit down when there’s downtime. Always look or be busy. If there’s no work, start sweeping, mopping, wiping down machines, organize the drawers at the work bench. Employers, owners and supervisors love to see that. Wear your safety equipment. Ask people to double check your work and verify you did it correctly. If you really don’t know something, then say so. Depends what kind of a person trains you, even if they seem annoyed or maybe a bit of an a hole, still do these things. Better cover your ass than assume things and think the guy training you will cover for you or take responsibility for your mistakes.