An important aspect of working as a scientist is writing things down.
In order to later on understand one’s notes and to reproduce one’s work, these notes should have a system.
Moreover, when working in science for years, one might need to go back to look at past notes as some problems keep showing up again and again.
In that case, the notes should be in a format that is timeless such that the notes can be read and understood even when the original software or service they were created with is not around anymore.

While these requirements also apply to many people working outside of science, most often in tech related positions, they moved me as a scientist especially and led me to establish and iterate on my own note taking system.
The core aspects of the system I am using are Obsidian and P.A.R.A.
Obsidian is a freemium, text-based note management system with large community and a rich selection of plugins to extend the programms functionalities.
P.A.R.A. stands for Projects, Areas, Resources and Archive, which serve as the four main areas that notes are sorted into based on activity.

I gave a talk on this topic as part of one of our groups internal online venues for short informative talks called GöHAT.
The full slides of the talk can be found here: Slides