Hi Joao! I think there is no best way, it completely depends on the user and what is important to him/her. I personally also write short resumes of my days, add a picture or two if it's worth adding. I also always add the location, this makes for a great overview on the map page.
I know from other users who also add entries retrospectively, even many years ago. And then again, other users use the app like a planner or agenda, so they create entries in the future.
But it's completely up to you, there is no right or wrong way to use the app 🙂