What do I need to know about operating systems?

Motivation -> We need operating systems to give easy access to the hardware of a computer. A processor (CPU) can only execute one instruction at a time, yet we can have multiple applications running at the same time, how is this possible?Operating systems manage the computer's resources.It is a collection of software that have the following functions:Schedule processes (applications) to be executedManage and give access to the memoryManage the file systemCoordinate all external devices (keyboard, network adapter)Manage usersProvide a user interface