Project Notes
Project Notes is the primary log that lists everything has happens to the Project.

Input
User - These are notes a User phyiscally typed and entered.
System - These are automatically generated notes documenting what happened.
Details

Note Type
The entity type in which the note relates to. These are not customizable.
Quick note
This is a customizable list of quick note responses. Quick Notes can be created in Company Settings, Project Quick Notes (permission required).