Chunk information using tables, lists, frames, and white space. Choose fonts and colors with readabiltiy in mind. Web users tend to skim rather than read so avoid dense layouts that make it easy to lose one's place. When to use pages on only one screen length, and when to ignore that advice. Tables Tables are one of the best ways to control how information will look on a website.
Frames There is much debate about using frames, but can be the right solution to some problems.
Colors Text in order to be readable requires high contrast, i.e. black text on white background, white text on black background. The worse choices for readability are red on green or blue on yellow. A much smaller percentage cannot distinguish yellow and blue. Images Images are a fun part of building a web sites but, again, they should be appropriate to the site's content and intended audience. Images should be captioned and copyright information should be included on the page.