The inset faces command is well-known with 3D modelers, but did you know these extra shortcuts? Follow Blender Secrets on Youtube... | By Blender Secrets | Facebook
Another attempt for an Inset tool in Blender • Blender 3D Architect
How to inset in Blender? (Faces & Cylinder)
Blender Inset Faces Extrude - YouTube
Extrude and inset — Blender for 3D Printing
Inset Faces Tool in Blender 2.8 Detailed Overview - BlenderNation
Round Inset - Blender Market
Inset faces that share edges - Modeling - Blender Artists Community