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
Inset faces that share edges - Modeling - Blender Artists Community
Inset faces that share edges - Modeling - Blender Artists Community
How to inset in Blender? (Faces & Cylinder)
Blender tool: Inset, how it works and when to use it - Artisticrender.com