This Handbook is primarily aimed at students of the Natural and Technological Sciences, in which Thermodynamics is a fundamental subject of theoretical and applied knowledge. This Handbook consists of two Parts. The first contains answers to thought topics and the second solutions to problems. The selection of this specific material was made with criteria clearly focused on the learning objective of consolidating the corresponding subject matter. Particular emphasis is placed on documenting the answers to theoretical topics, as well as on the thorough presentation of the thought process that leads to the solution of each problem. Through the thorough study of this handbook, the reader learns to become familiar with addressing thermodynamic problems, while also deeply understanding the acquired knowledge.