For example, the Android KitKat site, Transit.js and Apple's iPad site has these sections, headers and dividers that I'm looking for.
How are these beautiful sections made? I see the all the time on various web pages. Some of them even have image backgrounds and some sort of parallax effect going on in the background. Others have the sections fitted exactly to the height of your screen and limit your scrolling.
Are they all designed individually, or do they use some sort of theme or css stylesheet to get started?
The CSS stylesheets suggest they're not using any plugins or templates, but many of these sites are built by huge companies. Is there something like Bootstrap or another CSS framework that can be used to get a similar effect?
EDIT: The answers by Frankenscarf & Dominik are helpful, but I'm really looking for a framework of sorts to help with this, so I haven't accepted an answer yet
NEWER EDIT: the One Page Scroll plugin was exactly what I was looking for