I watch a lot of texture making videos. I’m not so good at it. I’m still trying to ‘get it.’
I came across this one: The FAST Method for Creating Realistic Materials & Textures || Blender Tutorial I’m including the link because there are a number of handy links on the YouTube page.
The CrazyBump normal maker talked about in the video is a US$99 retail app. There is a demo video on the site. It is impressive. The site is VERY small, almost nothing to read. If you an analytic personality, it isn’t enough.
However, CrazyBump has been around for a while. I first downloaded it in 2013, v12. It is now version 122.