Ok, this shouldn't take long. Here is how you can put a picture on a webpage:
<img src="someimage.jpg">
Ok, so this is a picture. It just says to place an image(img) and the source(src) in a webpage. So you just add this tag and you'll have a simple picture in your webpage

I would suggest that you put jpegs and gifs on your webpage only because things such as bitmaps take up way to much memory and are to long to load