Let's suppose you made any changes in the contact record. Then, this trigger will fire. It helps to sync the contact information and keep track of changes.
Once you've selected a trigger, you can configure the workflow's details. Here, select the Note Changed trigger under the Contact section.
All Filters
Doesn't Have a Tag
By selecting the "Doesn't Have Tag" filter option, this workflow will ONLY be triggered when you change a note for a contact that doesn't have the tag you specify in the filter area.
Has Tag
By selecting the "has tag" filter, the workflow will only fire when a note is added to a contact who has the specified tag.