Question
Is there a way to leave notes and comments?
Answer
There are multiple ways.
whole
Select [File]-[Project memo]It is possible to always display.

You can keep this window always on top. Please use it while doing <save>.

How to leave a note on the timeline
Please refer to the following article for how to leave a memo on the timeline ruler.
How to leave a note on the Fusion node editor
Please refer to the following article for how to leave a note on the node editor.
How to leave notes on clips