Pictures on Pages!

Side note:
Some browsers, notably Netscape, make use of non-standard add-ons to HTML. They can do things, like centering text on a page, that other browsers can't. HTML authors (you) have to decide whether or not you'll use them. Many people say "no", because by doing so, you prevent non-netscape users from making good use of your work. But some of the additions are pretty cool... :-)

Adding pictures to a page as decoration is easy. The hard part is finding or creating good images and having them ready (saved the right way).
The picture should be in GIF format
What? Graphics you look at on the computer screen can be saved to disk in many formats, and differently on different kinds of computers. If your image is going to work on an Amiga, an IBM, a Mac and some sort of high powered rocket scientist workstation, it's got to be in a format they all understand. Right now, the most commonly understood format is called GIF (Graphics Interchange Format). Some "browsers" (your version of Netscape or Mosaic) understand other formats as well, but you do a disservice to other internet citizens if you use formats they can't "see" (as discussed above, in a different context). Both Mac and Windows have free software that will convert pictures to GIF files.
The picture should be in the same folder (directory) as the page it's on
This isn't a rule, and sometimes is a bad idea. But it saves time and is simpler at first. If the picture is in the same directory as the page it's on, you can tell HTML more simply how to find it.
Use the IMG tag to tell HTML what to put on the page
Simply put <img src="filename"> in the source document for your page. The IMG tag doesn't have a "close" part (it doesn't come in pairs). The "src=" part tells HTML "find this SouRCe file please". If the filename is "desserts.gif", for example, <img src="desserts.gif"> will produce:
Images can be Anchors, not just pictures!
You often see pictures (usually small ones) that are meant to be clicked on... doing so takes you to another page (or part of the document). In most cases, such clickable pictures are simply a replacement for the text part of an ANCHOR.
The usual format of an anchor is <a href="filename">text here</a>. We can replace "text here" with our IMG tag <img src="goback.gif">, and the picture will become clickable. So instead of:

click here to go back a page

We have:

click to go back a page.

Notice in the source for this page that the instructions are the SAME. Because both anchors have the same href= part, they both go to the same destination.

Is there more?
duh? of course... but if you've come this far you know 90% of what's useful. Hope it's been helpful...
The End.
The Beginning:
If this is making any sense to you whatever, you might want to take a look at the standard primer for html vocabulary. It's fairly complete (but doesn't include Netscape's add-ons) and includes examples.