All sorts of things:

1. I use it for 3 general information displays (site updates, RSS feed updates that meet certain keyword criteria, and a weather dispaly) that i feed from terminal apps (the terminal apps print to text files, which Obsidian then displays)

2. I use it as a calendar/task manager that tells me everything from what i'm doing tomorrow to what i need to check in six months

3. I use it to organize world building stuff - everything from one-off ideas, to idea lists, to huge files full of names, places, etc even pictures.

4. I use it to organize true crime research stuff - both current and past cases, and larger cultural trends like the Satanic Panic.

Tags + folders make it very easy to keep stuff organized, which i like, and since i can just zip up a folder and send it to someone, it's very portable if it needs to be.