In this tutorial, you:
Setup a T-Spline form:
Edited the T-Spline box form to the shape of the image:
Used several controls on the Edit Form tool.
Used the Insert Edge tool.
Used the Insert Point tool.
Image as canvas (Left), T-Spline form around image and T-Spline without image, (Right)
If you would like to learn more about using Fusion, you can also check videos available from the here.