shaders - How to create high altitude clouds? (cirrus and cirrocumulus) - Blender Stack Exchange
Procedural volumetric clouds in Blender Eevee and Cycles – Render Everything | Blender tutorial, Blender, Eevee
Check out this useful volumetric clouds generator created by Daro Source for Blender. It allows you to add clouds and cloudscapes to the 3D scene and modify them without the need to
Creating a cloud volumetric material - Blender 3D: Designing Objects [Book]