HTML stands for : Hyper Text Markup Language, it tells the browser what to do. A page is build up quite simple. First you have the "head" part, in which you'll find information about the site. Best way to get to know what's inside there, is to check out the source of different sites.

Second part of the page is called "body".
In here you put the content of your page, text, images and anything else you want on there.

Here you see what the basic setup is for a HTML page.
To find out what goes where and how everything works, you'd best prepare for some serious reading. I do promise that its worth it, specially when you're building your first page, and see that it works. The site I used to get familiar with html is: http://www.w3schools.com/default.asp There you find great tutorials and numerous examples to try out anything.