I'm new to the forum and to web development/designing. I just have a newbie-question about how designs are transformed from static images to dynamic webpages. (And I hope this is the proper forum for such an inquiry).

I have begun learning HTML and CSS, as well as dabbling in some beginner-designing. I started out by using this GIMP tutorial for creating a webpage:

After I finished that tutorial, there was no mention of how to incorpoate this design with an actual webpage. I was left wondering how the tabs, and the catagories in the margin, turn into clickable links.

Which leads me to my question: How do static web designs typically transform into dynamic webpages? Any help is appreciated, thank you.