I recently found some video courses on Udemy that seem to give a great introduction to builing efficient mobile pages (or Landing pages for that matter).
Apparently for a limited time, the courses are 10$ (with coupon: mega10).
Responsive Web design
https://www.udemy.com/learning-responsive-web-design
JQuery Mobile
https://www.udemy.com/jquery-mobile
OR
https://www.udemy.com/jquery-for-mobile/
Thought that could be of interest to some !
Much thanks simon_la!