ADD STROKES TO A NEW GROUP

Draw, select the strokes, click on the Add button, name a group name.

MODIFY AND SIMPLIFY STROKES PATHS

Select a group, click on the Modify Paths button, play with options to reduce paths points, edit paths as needed.

EDIT GROUP

Select a group, click on the Edit Group button, play with paint null options stylize, transform and animate strokes.

TRACK GROUP

Select a group, select tracked elements (face tracking effect, track points, masks, 3d camera and 3d tracked solids), click on the Track button. Select the generated tracking points (no selection is going to select all of them), and track to apply tracking to the group strokes.