Notes app is one of the tools that you use as part of your productivity system. It stores all notes about your projects, topics you are learning, your hobbies etc.
Setup
00 - Inbox - Inbox for your notes
0.5 - Goals - All goals should go here
01 - Areas - All areas should be defined here
02 - Resources - All resource notes should go here (MOCs)
03 - Archives - All notes that you no longer need but you want to keep just in case, should go here
04 - Meetings - All meeting notes should go here
05 - Projects - All projects that you want to work or currently are working on should go here.