Buy and read "Structure and Interpretation of Computer Programs" aka SICP. Download a Scheme environment and do all the exercises. Use the multitude of resour

Buy and read "Structure and Interpretation of Computer Programs" aka SICP. Download a Scheme environment and do all the exercises. Use the multitude of resources to make sure you actually understand how, why, what. Hacking with Ruby, Python, C#, Java, Objective C, etc, etc is fun, exciting but you won't learn the foundation stuff which sooner or later comes up as a stumbling block.