UV MAPPING IN BLENDER 2.80

Uv mapping tutorial for Blender 2.80 by Daniel Bystedt

WORKING WITH TEXTURES

Very useful tutorial about creating tileable textures using Photoshop. When you have different shadow levels it seems a nightmare to fix it, but just a few of Photoshop steps to get it. Take a look to this (and others) tutorial by Neil Blevins

 Probably you know textures.com (previously cgtextures) one of the most popular textures resources site. There you can find another tuts about textures  and, of course, tons of texture for free or commercial. You only have to sign up.

MIXING TEXTURES AND SHADERS

I love it :)

FREE TEXTURES

Nice thread at Creativebloq about where to get free textures.
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Buen post  en Creativebloq sobre donde encontrar texturas gratis

LANDSCAPE TUTORIAL

Old but one of the most interesting tutorials you can find about landscape creation
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Antiguo pero quizás uno de los más interesantes tutoriales sobre creación de terrenos

PAINTING HARD SURFACES

Not only LW, nice tips.
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No sólo para LW, consejos muy chulos.