Most of the posts on this site are not written for an audience. They are written for me, months from now, when I have forgotten what a particular day felt like.
That changes how I write. I include the small details: what the market smelled like, what the train window showed, what I ate for breakfast. I leave out the parts I guessed at. If I am not sure about something, I say so, rather than writing it as if I were sure.
A notebook that is honest about its gaps is more useful than a guide that pretends there are none.