The links below provide much good background material. I do not agree with everything written by others, which is why I'm doing this website. However, it is good to read diverse ideas which, in turn, help you generate your own understanding.
amazon.com on entropy & energy
Wikipedia on Energy
Wikipedia on Entropy
Wikipedia on Entropy in Classical Thermodynamics
Wikipedia on Entropy in Statistical Mechanics
Wikipedia on Energy Dispersal
Wikipedia on The History of Heat