So our long held belief that reading about it and then doing some questions is the best way to learn may actually be true ... !
From the NY Times: "To Really Learn, Quit Studying and Take a Test" http://www.nytimes.com/2011/01/21/scien … .html?_r=2
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
Thorough once said that he would have learned more by sailing once around the harbor. Dry studying rarely sticks, being forced to apply your knowledge as in a test is a powerful stimulus. The adrenalin rush is unparalleled.
In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.