My "lesson learned the hard way" is that when choosing note taking / todo application it's a good idea to limit yourself to do it at most once per quarter. This is because there is infinite number of note taking / todo applications. For example in the class of outliners / "Personal Knowledge Management", some good ones are:

• Obsidian (I'm really enjoying this one recently - syncing across devices with Syncthing)
• Athens
• Roam
• Foam
• logseq
• RemNote

It's a good idea to use the ones that store text in markdown, because then it's much easier to switch to some other tool later...