Smart Face
shortcut 4
edit mode
Smart Face simplifies various common task around Faces.
Selection
in vert mode with 1-2 verts selected: smart face creation in vert mode 3+ verts selected: face creation from selection
in face mode with 1+ faces selected: create separate object, optionally go into focus mode based on operator properties, and optionally stay on the active object.
Redo Panel
choose Duplicate, Dissolve or Extract mode, and optionally stay on the original object
Using Smart Face
Note
This is an old video and does not cover all the features described above.