Notion brings most of my work into one place. I use it to organize notes, track tasks, and manage small project ideas. The interface is clean and simple, which makes it easy to structure information the way I want.
I also like the flexibility. Pages, databases, and notes can be combined in many ways, so it works both as a personal knowledge base and a lightweight project management tool. Over time it becomes a central place to store ideas, documentation, and daily planning.