Need Basic Topics On VPS

I’m going to present in a high school about Servers and I need to mention most important topics about VPSs in a short time. Can anyone suggest me any documentation that offers above mentioned data?
btw it should be in english.

did you try researchign the topic on your own? what did you find?

This is my starting point:

I will add to this page some other materials. I hope I could get some expert advise on my content.