Here are sample multimedia stuff that you can embed in your page.
A wav file and an animation:
which are both funny.
VIDEOS:
Embedding videos and showing them in your pages requires plugins for the specific browser.
There is a lot more you can do with your pages and these are only some ideas that I had learned through experience.
Start with HTML, then learn other programming languages. It comes with time, trial and error and a huge chunk of patience.