How To Merge Two Faces Easily with Several Different Tools
modeling - How to merge 4 adjacent, coplanar faces into a single face - Blender Stack Exchange
Vertex Tools — Blender Manual
Deleting & Dissolving — Blender Manual
How to Merge Vertices, Edges and Faces in Blender
Connect Face (blender addon)
Is there a simple way to merge all the same faces on these simple objects into a single face per side after I finished making the blocky shapes? : r/blenderhelp