Website design is really tricky business. There are some many things that you need to learn so that you will be able to create the finest of websites. Remember the development of a website will affect not only its performance but its ranking on the search engines.
The search engines have become ridiculously strict on what they give out to their users as top results on the search engine results pages. The quality of the work done depends on the technical knowhow of the designer. There are such things as JavaScript and CSS that every developer needs to understand.
Source: FormDev