Web design should be such that visitors of the website find it easy, to get the information they requires on your website. The information searched by a user should be easily available to them without much navigation from one page to other. Web design should be attractive and users should like it. Content matters a lot in web design but it should also be visitor friendly. Choose the design for pages which looks attractive and gain attention of the visitors to stay at them.
Now with the various web designing tools you can easily design a webpage according to requirement. Designing software is also available now which make it easy for the web developers to imply the changes when ever they notice any error in design. You can evaluate the web design of web page with help of various web analytics tools which are available online for free.