I've created a bump, reflection, and Displacement maps out of an image texture with the help of photoshop ... credits goes to blender guru : r/ blender
texturing - How to properly hook up various maps types in Cycles? - Blender Stack Exchange
Specular Map Blender Tutorial - How to use Specular map in Blender (Blender Cycles Tutorial) - YouTube
texturing - How to properly hook up various maps types in Cycles? - Blender Stack Exchange
Combining Bump and Normal maps causes weird reflections, change in colour brightness and flat shading (color space is set to "Non-Color Data") : r/blenderhelp
Help] Black spots on render when attaching normal map (or displacement) : r/ blender
Blender Guru and Poliigon creator Andrew Price on what he think?
Problem with Bump Maps and Reflections (Cycles) - Materials and Textures - Blender Artists Community