Ok basically what the title ask. There are so many note taking apps available and also the good old notepad, but, how do you take notes? What do you actually take-keep notes on? Is it like complicated things or simple ones?
All time times that I started using an app or a pen and paper intended up just using a simple reminder for things. Others I just remember.
Which application or software one uses is far less important than which note system to use. Mainly, the best note system is the one you actually use. Bear in mind, the system used depends on context.
Academically I rely heavily on Cornell Note Taking System, and recently I’ve dabbled with atomic style notes using Obsidian. There are plenty of trade offs on those two systems, but I found tremendous value in being able to back reference the same note over and over again.
For one-off reminders, I just message myself. Long term reminders end up either on my calendar, or more recently on Trello.
Keep experimenting. Keep what works, dump the rest; avoid being dogmatic to a note system, application, or software.