For newbie

I think it would be really helpful if expert programmer or guys that know better Grav make a video tutorial on how to edit completely a website. Just the easy steps.. Like how to get images moving.. Or how to customize the images on a skeleton readymade ect.. Thanks

Maybe try this: http://grav-tuts.teachable.com/

There is also https://webdesign.tutsplus.com/courses/up-and-running-with-grav-cms

Looks "under the hood" too and creating a custom theme, all in ~1.5 hrs

There's also the most basic, it and so it is in the documentation.