what not to do.

Do not use random colors.( have  a nice color scheme that matches and is not hard on the eyes.)
Do not use mystery meat navigation.( weird navigation is confusing.)
Do not try and fit as much info as possible and not make other pages to that website.
Do not use crazy fonts.
Flashy colors are a no no.
Do not throw in random pictures or videos to take up space.
Sideways navigation is confusing.