Operating system is a very important topic to learn if you want to make a career in the IT industry. You will find operating system questions being asked in many of the technical roles like SDE, SRE, DevOps, Cloud engineer, System admin, Support engineer etc. The level of questions being asked will vary depending on the requirements of the company. SDE interviews may focus on understanding the basics of operating system concepts whereas SRE/DevOps/Cloud/System engineering roles may test in depth understanding of Linux operating systems.