HTML Tutorial at W3C. Perhaps you'd be interested in learning more about HTML. This simple introduction teaches you about links, images, and formatting.
freeimage.host or Imgur could be useful – both are image hosting services. You can use services like them if you want to be able to upload your own pictures to use on your home page. That's where the goose comes from – upload your image, then when it's uploaded, right-click your image and click "copy image address". You can use it in a <img> tag to embed it.