There are 4 laws of thermodynamics, zeroth, first, second, and third law of thermodynamics.
Zeroth law of thermodynamics: If two systems are each in thermal equilibrium with a third, they are also in thermal equilibrium with each other.
First law of thermodynamics: A change in the internal energy of a closed thermodynamic system is equal to the difference between the heat supplied to the system and the amount of work done by the system on its surroundings.
Second law of thermodynamics: Heat cannot spontaneously flow from a colder location to a hotter location.
Third law of thermodynamics: As a system approaches absolute zero, all processes cease and the entropy of the system approaches a minimum value.
Actually, to understand more simple about thermodynamics lets focus on the first and the second law of thermodynamics. If you have already read above about this law, you know that they have to do with energy, the first explicity, and the second emplicity.
The first law says that energy is conserved. That's all; you don't get something for nothing. The second law says that even within the framework of conservation, you can't have it just any way you might like it.
If you want to understand thermodynamics with simply way, this book is the answer. Language is informal, examples are vivid and lively, and the perspectivie is fresh. Based on lectures delivered to engineering students, this work will also be valued by scientists, engineers, technicians, businessmen, and anyone else. But if you want to understand thermodynamics deeper, better if you use this book: Fundamentals of Engineering Thermodynamics. Even it's more expensive, this book maintains its engaging, readable style while presenting a broader range of applications that motivate student understanding of core thermodynamics concepts.