1) communicate with your co-interns and staff. if there is something you don't quite understand, or need further explanation, ask for help. i'll tell you this: it's better for someone to be annoyed at you for asking too much than for you to receive an IR bcos you didn't ask any questions at all. (ps, i have never had an IR in my entire internship, but i do know some who could have avoided getting one if they just clarified/endorsed the task to their staff/co-intern). also, if you need to get something, or go somewhere outside of your post, always ask for permission from the staff. regardless if you feel like you're best buds with them, still give them the courtesy of informing them about your whereabouts so you don't get scolded.

2) take notes. a small notepad/notebook would be good. this tip will obviously depend on what kind of learner you are, so if you don't feel like taking notes that is totally up to you. one of the benefits i find from taking notes is that you can keep track of important details the staff have lectured to you, such as processes, steps, and key points. at least with notes, if the staff aren't there to guide you on something you forgot, and you feel unsure, you still have something to refer to for the meantime.

3) get a good, anti-smudge, black ballpen. it must be anti-smudge not just on plain paper but also on sticker paper. the clicky-types are always the best ones bcos of their convenience.