These might include anything from allowing the site to use the content for promotion to requirements about what kind of content you can or can not put on the page.
Web community aimed at teenagers offers free web space and a lot of information of interest.
Offers A LOT of free space for your page. Also offers free clip art. Most ISP's offer free space to put up your own webpage. This is great if you already using their service in the first place. Seperate service offers low cost e-mail and web page space.