Problem with sharp vertex in solid view - Technical Support - Blender Artists Community
Blender: How to Add a Vertex – Simply Explained | All3DP
Script: Align Vertices to Grease Pencil Stroke - BlenderNation
Merge Vertex, Edge or Face – Blender Knowledgebase
File:Example of T-vertices in Blender.png - Wikimedia Commons
GitHub - Philipp-Seifried/Blender-Normals-To-Vertex-Color: Simple Blender 2.8x addon that copies a selected object's normals to its vertex colors. Useful for some shader tricks.