Human eyes play a much more important role in designing the site. If a site doesn't look nice, the visitor will skip it instantly, but if the look is nice he will wait and find the details of it.
Key features of website :
Website should be easily navigable. It should be quick to download. The layout and design should be consistent through the site. It should be user friendly. The page should be easy on the eyes, must be cohesive and readable.
Rules for website design
The prime thing in designing a site is it's look, color combination, page setup, images etc, this is what a layman thinks, but a web professional takes it in other way. The main thing for a professional is to make the easy cacheable, good content, images of less size and it should open in less time. Because when a visitor opens your site, he will wait for 10 to 12 seconds but not more than that, if the page doesn't open he may skip it. Couple of things more , which should be avoided from use like, heavy animation, black hat techniques, use of popup windows. Apart from this don't forget to use "alt tag" for images and hyperlinks.
Make the site User friendly
Use of latest technology and updateing site is good, but we should keep in mind that our target visitors are also aware of the latest technology and they can easily use it. Try to write all the coding in HTML, which helps browser to support. If we use a coding langue that all the browser doesn't support, so we can't reach to the target.