Web design should not be written to only accept mouse input, design to accept keyboard input so as not to alienate users that use other methods of input
Using 10px or less for fonts, text will be too small to clearly read and visitors will not put the effort into trying to figure out what is being said.
Do not use more than 2 primary colors and a third secondary color; you want the site to be attractive not hard on the eye.
Avoid clutter, keep the page balanced and utilize white space.
Don’t use static web pages as they are hard to keep up to date.
