A good web designer must be familiar with the basic principles and elements of web designing. Don’t think that what looks good is the correct way of designing. If you're going to design a website, you better have some idea of what you're doing when it comes to graphic design.

Balance- It is important for things to be balanced. This means that you can't make one side stronger and not balance that on the other side. For example, if you use a dark color, you should balance it with a larger area of a lighter color. Balancing will prevent your website from looking funny to the visitor.

Line- The directions of your lines will give a mood to your overall design. As a rule, horizontal lines are calmer, vertical lines are moderately active, and jagged or diagonal lines are very active. If you were designing a sober news related site, then, you'd use horizontal lines, while a fun site for youngsters would be full of lines going in all sorts of directions.

Shape- There are two kinds of shapes – positive and negative – and every design has both kinds of shapes. The positive ones are the ones you actively place on the page, while the negative shapes are the spaces created around the positive ones.

Color- Coloring is a bit more difficult part of the web design and you need to be careful about this aspect. As soon as you add more than one color to a page, you make the other colors look different. Some colors are complementary, while some don’t look that great together. On the web, you should usually avoid using too many colors on one page – even if they are complementary, it might make the page look garish. The best way to create a color scheme is to use black, white, and various shades of one color. You have to consider the brightness and intensity of your colors, to make sure you're not overdoing things. One of the mistakes many designers make is that they use the built-in CSS color-these are too intense.

This is just a brief overview of graphic designing and in sense gives you complete knowledge of this vast subject, and one that's changing all the time. If you want to get properly up to speed, it's worth buying a book, or even taking an evening course at your local college – you won't regret it.