A phone or a laptop. An email address. About ten minutes. There is nothing to pay for in this entire course, and if at any point something asks you for a card, you have taken a wrong turn — close it and come back to this module.

If you have both a phone and a laptop, start on the laptop because typing is faster while you are learning. After this week, most of you will use it on a phone, and that is completely fine. Everything in the next eight modules works on a phone.