There are many sites out there with which you can teach yourself web design. I remember years ago when I taught myself by using
HTML Goodies Though the site has changed there are still many tutorials available to start your out.
I also like W3C Schools -
W3Schools Online Web Tutorials - the world wide web consortium (W3C) is an international organization that works together to offer standards for many languages and technologies, so these guys are experts.
If either of these seem overwhelming you might try html.net -
Learn HTML and CSS - Use our free tutorials - Build your own website | HTML.net - because the tutorials are very basic here.