I’m actually not too proficient in that area myself and I don’t plan to get there any time soon. I took a break from this course, forgetting a bit more than I liked. 
So my focus at the moment is to complete this course and then do the “Complete Blender Creator” course (also by gamedev.tv), alongside a few first blender projects. As for textures I settled with becoming a Patreon for https://cc0textures.com/ and using textures from there - because, as you said, they are really good! 
Excellent advice by @Michael_Bridges
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