I am looking for some type of description that would explain what the Knowledge and other tabs are used for. Is there a place with all this break down of the tabs?
As previously noted there is not always documentation on exactly what each threshold is used for but the way to dump out the exact content of a threshold (Or any document in the Knowledge Folder) and its subsequent as well as any notes within the threshold container is to utilize the help function for any out of the box or user generated one. This is a great document to provide with change control processes, backup, as well as for reference when building a new threshold as well.
A good tip is for user generated threshold condition ones is to create disabled condition(s) that the condition name is a version identifier of the container.
Another is to utilize the text / remediation text (11.4+) in any condition to can contain actually documentation like (v2018-05-01 even).. it will appear in the body of an alert but is good for those both receiving the notification but also for tracking changes... both of these tips require some consistency in practices within an organization though as like versioning for example is not inherient to a threshold / display container.