from my experience
and I might be repeating things people already said: when emailing a professor, always start with "Dear Professor *some last name*" "dear" sounds too friendly but it is the common way to address someone respectfully. as people said-race issues are very sensitive. try to be as politically-correct with people you don't know well. I don't know if this is obvious, but NEVER say the N word. not even if you're talking to someone about how racism still exists and you want to tell them that you heard someone say it the other day. you have to say "I heard "someone say the N word (just an anecdote- on my first year here I was talking to some people about hip hop and rap music, and I wanted to say muzika shchora, so I said "black music". they looked at me like I was insane. doesn't translate well.) people often dress fancier too. job interviews etc- don't wear jeans. it's ok to ask what's the dress code for something, and then just look it up (business casual is always a good bet when in doubt) also in general people are much more polite than in Israel. this is probably something you'll just pick up without thinking about it, but maybe it's worth mentioning. like you actually have to say "excuse me" when you want someone to move out of your way, can't just push them. so yeah, "excuse me", "sorry", "please", and "thank you" should be used a lot. when given a specific time to be somewhere/start something, that is actually the time you have to be there. not 5 minutes later. a little early is always good. I'll try to think of more. but generally people might also be pretty accommodating if they know you're not American and won't get too offended by inappropriate things...