Create and preview texture in Blender 2.80b? Tutorial for 2.7:

https://www.wikihow.com/Apply-a-Material-or-Texture-in-Blender

On step 4 I should already get a textured cube but it doesn't work. In the same time all the tutorials are for 2.7 version (or for 2.8 but use advanced texturing which is more complex than just assigning of texture to mesh).

So how to deal with textures in 2.80b?
The workflow of creating materials &amp; textures is different for each render engine.
The tutorial you are trying to follow explains Blender Internal renderer workflow, it is fast and easy, but this renderer is no longer supported in Blender 2.8, so this method is no more applicable.

This means - if you want to learn how to create materials and texture your models in 2.8, you have to watch tutorials focused on 2.8 and it's supported renderers (Cycles / Eevee).