Take a look at the Reference Guide. For 14, page 1974 (PDF) discusses the Material Texture Panel and how to click the Search... button to browse to one of those textures that you've discovered.
Start at page 1970 - "Create a New Material".
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB