W2s, 1098-T (if student), any relevant tax statements from your bank, investment firms, brokerages, etc.

As you go through your taxes the software will tell you what form is needed for [thing]. If you think it applies to you, go look for the form in the relevant account you hold.

I just did mine a couple days ago, had to go through 3-4 different accounts gathering everything that I forgot about when I started.