hello people. I'm reading three books to learn how to develop games for 2d IOS and Mac, but not only, to also learn to make programs for other things. I say order the books that i will read: 1º-Programming in objective-c 2.0 2º-Iphone programming the big nerd ranch guide 3º-Beginning iphone games development and I use xcode with cocos2d to do what I need but I saw a program called corona SDK and all say it's very good, but has a problem because it is paid and I would like to ask you if after reading these three well good books and learn everything you read and understand very much, I bought the corona SDK? is really good and easy to use this program to develop games 2d? and only one more question, after reading these three books that advise me to improve and to learn more 2D games for Mac and IOS?