Tags are a great way to categorize tasks and filter your view to sharpen your focus.Use the shortcut ^ to assign a tag to a task. You can assign multiple tags to a task!

Filter every view by tags:

• tag one of your tasks, this tag will appear in the filter bar at the top of the list.

• filter by multiple tags by holding down Cmd (on Mac) or Ctrl (on Windows) while selecting tags.

Tag Page

Once you assign a tag to a task, the task will also appear on the Tag page.To jump to the Tag Page

• Use the Go to feature (hit G)

• Hold down cmd (mac) or Ctrl (Windows) while clicking on a tag

Check out more at this link!