Operating System is the only thing that makes your life easy to adapt with latest hardware technologies such as desktop, tablet, phone, etc. It is an interface between hardware and you. It is like a huge collection of program that manages all the other programs and hardware on a computer. There are lot of process/program running behind your eye which are the great contribution of developers to make a desktop/laptop/tablet/phone etc. user-friendly. Think of OS as knowing how a car works, which surely you won't need to drive the car. But it will be helpful when you get into trouble while driving. Knowledge of OS will be very useful if you want to pursue career in Computer technology. In such case, you can find yourself in situations where the problem will be closely tight with the operating system/box you will be using. Before completing your software, knowledge of OS will help you to code the application, because the developed code may affect the hardware. The available ways to learn this course you should get the knowledge on process communication, synchronization of threads, file open/write permission error, so on. Even in programming languages/platforms where there is a significant distance from the OS, like Java or Python. OS will be helpful in knowing the intended behavior of the library or method you will be using.