Web usability is the ease of use of a website. Some broad goals of usability are the presentation of information and choices in a clear and concise way, a lack of ambiguity and the placement of important items in appropriate areas.

Resources website

Usability 101: Introduction to Usability

Nielsen Norman Group

Website Usability: Virtual Elephants of the Internet Room

Bosmol Social Media News

125 Easy Tweaks to Optimize Your Website’s Usability Today

Nick Kolenda

Usability: A part of the User Experience

Interaction Design Foundation