Here's a free Principled BSDF Shader guide to help Blender users, an extract from the free PDF guide and YouTube tutorial below, hope you find it useful :D : r/learnblender
Unity - Manual: Model Importer: Materials
Blender to GLTF/GLB -- Where are the textures? - Content creation (3dsMax, Maya, Blender, glTF) - Babylon.js
FBX export has no material - Materials and Textures - Blender Artists Community
texturing - Extracting Textures from model - Blender Stack Exchange
texturing - Extract Texture from a 3D blender model - Blender Stack Exchange
How to extract textures? - Blender Stack Exchange
How to export .obj format file with texture in blender? - Stack Overflow
Fix pink textures in Blender with iRender Cloud Rendering
Model Importing Guide (Blender) [Super Smash Bros. Ultimate] [Tutorials]
Export UV Layout (Texture Maps for IMVU) – Blender Knowledgebase
texturing - How do I extract a texture .png from an FBX? - Blender Stack Exchange
export - Exporting Texture Files as PNG or JPG - Blender Stack Exchange