I am planning on moving my shit away from Notion.

The whole "2nd Brain" thing does not work for me (it just gives me busywork instead of doing something useful) so what I am looking for

- self-hostable
- should have a web interface I can use from any machine without installation
-I need "tasks", "projects" that contain tasks and "notes" (ideally optionally connected to projects and/or tasks)
- boards for tasks
- mobile app or good mobile website
- I want it to look nice
- bonus Points for offline mode/Linux client

Any suggestions? (Assume that I can google, I'd like recommendations of things you actually used at some point in time)