In the fields of physics and engineering, thermodynamics and heat transfer are two essential and related ideas. Nonetheless, undergraduate students frequently find it difficult to understand the connection between these two topics. The goal of this book, "Fundamentals of Heat Transfer Through the Lens of Thermodynamics," is to close the knowledge gap and offer a thorough grasp of how thermodynamics and heat transfer are connected. This book, written with undergraduate students in mind, aims to make readers fully understand the fundamental ideas and practical applications of thermodynamics and heat transfer. We have intentionally linked thermodynamics and heat transfer throughout the text to highlight the significance of combining these two fields. Considering that there are countless questions that cross our minds for which there is no simple solution, throughout the book, the answers to frequently asked questions are included in addition to theoretical concepts. The book ensures you have access to instantaneous answers to your questions without delving into theories, and it provides theoretical concepts as a safety net.