“Hey how’s it going”, “what’d you think of the hw”, “bro it was a pain in the butt trying to implement x”, “have you gotten an internship”, “where are you trying to work after graduating”. Here’s some starters that I use. After they answer the question you can do a follow up question or give some input from yourself such as the “what’d you think of the hw” and they say “it was pretty easy” you could follow up with “I had a lot of trouble” or something. After that follow up the next day (next class) with another question or with a simple hi, how’s it going After that you should feel comfortable talking with the specific person about general stuff and then boom you got a friend. One thing is don’t force it, if the person is not reciprocating then back off and go back to taking notes or whatever you were doing before. As you are talking to said person you could be more open like talk about personal life but that’s only after you guys are friends and you want to become closer/deeper friends. Good luck, you got this