Learning 

is to memorize what have to memorize, comprehension of individual concepts and relations, and comprehension of the relations between parameters and how they effect each other and the whole system. 

Creativity 

can result in different comprehensions or points of view and then, different methods for solving problems. 

Skill 

also comes after becoming clear and exact about everything by practice and the result is increase in speed. 

Mastery

is Complete learning + Creativity results + Skill

What we learn? 

Theories - with the structure of 1- Definitions/Principals/Assumptions/Modeling or defining parameters 2- relations which are theorems and their results (mathematical, physical, psychological, illusions and ... ) 3- Problem solving