In terms of a project to work with? Hard to say - perhaps think of something you’re interested in and make something around that?
I started by making a site (no longer online as this was 6/7 years ago now) that allowed people to play leagues on an online football game. It required user registration, user login, and automatically updated the football tables depending on the scores people posted. I did that because I enjoyed the game. Is there anything you can think of in a similar vein that might be interesting for you?
If not then I’d suggest at least making a site that has user registration + user login, as that’d teach you about sessions and stuff like that. Then I dunno, think about stuff you find interesting. Perhaps do a to-do list that allows you to login, set dates for things and will email you to remind you about upcoming things or something like that?
Don’t do anything massively complicated as you’re just learning for now. The stuff I’ve mentioned above will teach you plenty to get going 