Dear student, in this course we will introduce the principles of heat transfer to engineering students at the undergratuate level. It covers the fundamentals of applied thermodynamics and heat transfer courses up to Honors Degree Standard. From the thermodynamics view that heat energy can be transferred by interactions of a system with its surroundings. These interactions are called work and heat, which provides no information concerning the nature of interaction, finally, I hope that the e-course will receive acceptance from its readers.