One common mistake new developers make is to overdo it when putting together a web site. It's very easy to go overboard with new 'toys', so try to use extras in moderation. Some common things that get overused are:

• excessive graphics
• frames
• background images
• bevels and other graphic tricks

Too much of something just comes off as being tacky...but used sparingly it can add just the right seasoning. When spicing up your site, try to add things only when they complement what's already there, and not to overdo it when you find something you like.

Too many graphics will bog down a page, too many frames will make it difficult to navigate, too many graphic tricks will just end up looking silly. But any of these things will add nicely to the site when they're called for...put the design and layout first, and then dip into your bag of tricks when you need something.