For text (and so is this)
This is a paragraph of text. It contains an example of bold text, italic and both together. Although bold and italic might be considered to be presentational, and therefore it might be argued that they should be done using stylesheets, the general consensus is that they are such common forms of text-embellishment that the style can be considered to be a part of the text itself, not the display of it on the webpage.
Here's a link to another page located on the same server as this page and called otherpage.html. In contrast, here's a link to the BBC News home page at http://www.bbc.co.uk/news/ Make sure you can do both without blinking!
For images
This is a paragraph of text with an image in it! That image is stored on the same server as this page, in a folder called images. Do it the same way.
Here's another image but this one is on a different server. Its URL is: http://upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Darvasa_gas_crater_panorama.jpg/320px-Darvasa_gas_crater_panorama.jpg but it's also a link so if you click on it, it opens the full size version at: http://upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Darvasa_gas_crater_panorama.jpg/1280px-Darvasa_gas_crater_panorama.jpg
