What should I write in my Notebook? :)?

I got a really cute notebook and I want to use it but Idk what to write in it I dont want a diary or to use it as a sketch book. I want it to be useful like put info in it about anything not school stuff though more like on life but idk how to go about writing or organizing it just thinking about writing something and not being able to change it makes me uneasy thinking I just ruined the whole notebook lol