Assume that 80 percent of the visitors to your website will be using only 20% of the functionality of your website. It’s a rule of thumb, but it will help you focus your effort on those import functions that will prove most useful to your website visitors, thereby enhancing their satisfaction with your website.

Try and make the top 20 percent of functions easily accessible via easily distinguishable buttons or links, and preferably accessible from every page of your website.