Divide page into sections?

Hi there.
I have a problem. I want my page to be like here : http://stereocreative.com/
When I scroll a mouse it goes to next like section. I tried this on different screen sizes and it always fits size.
Maybe somebody know how to make image a just div always fits the size of the screen and how to make this ‘moving’ to the next part of the page like on this example page.

I tried by myself but unfortunately I didn’t figure out

As for now it is difficult for me to dive deep in such a big web sites codes that’s why I ask. I figured out about fitting the page height but also don’t know how to make this animated change. But I will try to read more of their code