I left this out of a past post so I’m going to say it now.
One of the best things to write about is what you’ve learned. The best way to learn something is to talk about it. It’ll stay fresh in your head and help you concrete what you’ve learned.
If you’re learning about something you love then its the easiest thing in the world. Even documenting events you’ve done and learned from. Life experience is always the best to write about.