Text annotations can be added to almost every Element in a Process. They can contain a description of what an Element does, for example. To add an annotation, select the Element and hover over 'Append Text Annotation'.

Group Element is used to visually illustrate a relationship between a set of Elements in a Process. It can be added from the toolbar and resized to cover a set of Elements, with a naming convention to help with readability.
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For example, a Group can be used to illustrate a specific functionality within a Process. The Group Element is essentially a visual rectangle and must be sized and positioned manually over the other Elements.

The next article is Example on How to use Tooltips.