I've found a very simple planning method with Bullet Journal. It seems a really easy and successful.
All you need the notebook and pen. Just write tasks, events and notes; make collections and shopping lists; plan a vacation etc. Then strike out the completed points. It is easy to follow and move the undone points from one day to another day inside the journal, and identify what’s important and weed out the things that aren’t. And that's it all, just day-by-day.
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I will try this planning method and hope to get rid of hundreds of Post-Its on my desk.