I have tried different solutions for taking notes but I’m always coming back to Evernote. There are some reasons for that.
First of all Evernote works on all platforms.
Second, Evernote works with tags and tags are a key feature as you can use different tags on the same note compared to folders/notebooks where you can only put one note in one place. I might for exempel use tags for priority, errands and something about what it is.
Third, Evernote can read PDF:s and even read handwritten notes so they are searchable. That’s another key feature.
It’s free to use Evernote with the basic functionality but to be able to get all the benefits I do recommend the paid version. The payback for the small fee is huge.