Understand the 3D keyer, how it works, how it relates to other keyers like HSL and Delta Keyer, and whether or not it is suitable for Green Screen keying.
Turn hard keying problems into realistic comps. Breakup a complex keying shot into logical steps and work on them one at a time.
Improve your masks, fill holes and fix edge problems. Master the Matte Control tool for simple and advanced problem solving.
Solve complex Keying scenarios by combining keyers, hard and soft key, despill, and integration. Build a reusable keying workflow.
This is why I use Fusion Studio together with DaVinci Resolve Studio. My thoughts on Interface, RAM management, Resolve FX and more.
Understand and use all Disk Cache levels in Smart and User mode: Fusion Output Cache, OFX, Color Node, Color Output, and Sequence Cache.