Basic rules of web design - easy to read

Your web site should be easy to read

The most important rule in web design is that your web site should be easy to read. What does this mean? You should choose your text and background colors very carefully. You don't want to use backgrounds that obscure your text or use colors that are hard to read. Dark-colored text on a light-colored background is easier to read than light-colored text on a dark-colored background.

You also don't want to set your text size too small (hard to read) or too large (it will appear to shout at your visitors). All capitalized letters give the appearance of shouting at your visitors.

Keep the alignment of your main text to the left, not centered. Center-aligned text is best used in headlines. You want your visitors to be comfortable with what they are reading, and most text (in the West) is left aligned.

Read details on how to make your web site and web graphic images

source: http://www.grantasticdesigns.com/5rules.html