The Notes module in SuiteCRM can be used to keep a record of any comments, observations or explanations that a User may have relating internally to their organisation or relating to another SuiteCRM record such as an Account, Contact, Lead or many more. Notes are also used to keep record of interactions with Customers regarding Cases and Bugs.
Access Note actions from the module menu:
Create Note or Attachment – Opens a form to create a new Note record.
View Notes – Redirects to the List View for searching and listing Note records.
Navigate to the Notes module and select "Create Note" from the Actions menu.

Subject - Subject of the note
Assigned To - User responsible for the document
Related To - The Parent record the note is related to (Account, Contact, Lead, etc.)
Contact - The Contact associated with the note (if applicable). This field will dynamically hide if the Related To is Contacts.
Note - Note Content
Attachment - The file attached to the note (if applicable)
Content is available under GNU Free Documentation License 1.3 or later unless otherwise noted.