The book has two parts: the first part covers core topics of fundamental thermodynamics commonly sought after by professionals, while the second part explores about 30 broad categories of different aspects related to various areas of thermodynamics, encompassing over 300 typical subjects in the form of notes for the benefit of readers. These notes provide answers to numerous technical questions that may come to mind.This comprehensive book is designed to benefit both students and professionals alike. For students, it offers a solid foundation by covering core topics of fundamental thermodynamics and provides answers to common technical questions. For professionals, it serves as a valuable resource with in-depth exploration of various thermodynamic aspects across different industries, enhancing their understanding and knowledge in the field.The author humbly believes providing both fundamentals and relevant technical notes can offer a well-rounded and comprehensive learning experience for individuals and the book has the potential to be a lifelong resource that will greatly benefit both students and professionals in various ways.