If you can afford small monthly payments (less than $50) a credit-builder loan may be one way to go. I like it because the money is not released until the loan is paid off, and at that point, you should have a good payment record and some cash. The advantage of an older card with an excellent payment record is “age of credit” plays a (small) role in your score. On-time payments and amount of credit used are far more important.
While you are in school is not too soon to start “worrying” (and I hope not too much) about credit, so it will be there when you need it. You could “set it and forget it” with a card you put a small, recurring charge on, and then put on autopay. You get the record of consistent, on-time payments without any danger you’ll forget. A low-cost monthly subscription fee is ideal for this. It is good to have credit available if/when you need it. And if you need it and don’t have it, you can’t conjure it up . . . so now would be a good time to begin to establish it if you wish to have it later. (I actually have added adult children to a card without actually giving a physical card to help add age to a score.)