Topics help categorize Community content and increase your ability to discover relevant content.
Hi, there, I am not sure whether this helps but I do use the "Quick Note" inline editable field such as what Susie is referring to for my personal notes entered on the fly.
You can track that custom field in the update feed, however, note that the text entered to that field will appear in a "System Update" the same as any other custom form field that is tracked - meaning it will be hidden when you turn off the "Show System Update" visibility in the update feed.
I also provide a "Project Notes" report of grouped by project. It filters notes for each project entered in the last 2 weeks all displayed in nice project groupings.