Web UI/UX is much more complicated than mobile usability.
There are fundamental principles for both:
★ Design shouldn’t have any useless elements. Delete an element if you don’t lose a context of your page.
★ Central position on the page is the most valuable place. Key elements should be in the center.
Mobile Usability must be fast. Speed is the most important in the mobile design.
★ Pictures make page beautiful but mostly they are useless. Use them carefully to make downloading faster.
★ Use only one font.
★ Main content must be at the center of the page.
★ There are 70% display-width are visible on the desktop. 30% on the right side use for supplemental blocks or leave it blank.
★ The first display play one of the most important roles how a user will use your website. Put navigation on the first display. All navigation that user don’t see on the first display will be useless.