Ask HN: Learning HTML

Hello everyone. My girlfriend wants to learn HTML & CSS (she makes jewelry and wants to manage her website personally), and I was hoping you'd be able to help me out with a few recommendations.

The only stipulation is that they must be free to access. She is open to a variety of learning styles, so a wide range of approaches is acceptable, from step-by-step tutorials to videos.

I'm a web developer myself, but I've either forgotten a lot of the places that helped me when I first started out, or they just don't exist anymore.

Thanks again for your help.