Collections is important For organization and provides a way to animate multiple Shots in your Scenes a little easier. You can also use instances and Collections to save modeling time, and have faster renders.
 

Insipration

Well, interesting to note, This guys shots are movie level quality.  He's using compositing for sure with the different layers of background, mid ground, and the street with the cars.  Sort of reminds me how lucas had the motion control rigs to shoot the different elements with the same camera motions. 

 Animation Nodes in Blender 2.91 (Install and first steps) - BlenderNation

This is a free plugin.  Blender is making an everything node that does some of this nodes functions

Beginner tutorial

Sculpting in blender is like zbrush.  People have sculpted fantastic things in Blender.

Beginner

He Goes over the tools in the blender sculpting tab

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I made this image using 3 different Tutorials.

I used this one from Just the basics for the rock textures.

Beginner

Talks about how to unwrap with seams.  Where to choose the seams. (like the bottom of the fence)

He talks about some tricks and tips to be aware of when fixing Uv issues and other texture issues