For the most part, flashing and animated things are to be avoided. Less is more. Music or sound effects that automatically play when as the page is viewed are usually a bad idea. They often take too long to load and are not appreciated. Don't put a page on the web until there's something on it worth reading.
Frames are basically evil.
In most cases they take up more space than they are worth. More importantly, they violate the basic premise of the Web, namely that every page should have a unique URL address. The Congo Cookbook uses no frames. Links should lead to other webpages. It's plain stupid to have a webpage with a link to that same page.