Write and store internal private notes about your contacts in the 'Notes' tab of the profile card. You can see who wrote each note and when. Click on a logged note to edit it.
Did a volunteer leave your organization? Write the reason in the note. Did someone give you valuable feedback? Keep track of their thoughts in a note. Notes help you ensure no information is lost.
When you add a note, your action is logged in the dashboard's activity feed. Stay up to date on what other admin's are saying about your contacts by keeping an eye on that activity feed.