3D Touch for Power Users – MacStories
Author: Ryan Christoffel
It has been over fifteen months since I began using 3D Touch, and I'm convinced that the true value of it only becomes evident through dedicated practice. If you just use 3D Touch now and then, you may find yourself frustrated by not knowing or remembering what all it can be used for. The lack of iPad support doesn't help here.
If you have an iPhone 6S or later this is pretty good roundup on some 3D Touch.