Does a system administrator have to be an expert in one or more operating systems?

Question

System administration

Does a system administrator have to be an expert in one or more operating systems? That is, it's better if I know a little bit from Windows, Linux, FreeBSD like that, or, let's say Linux is good. It is clear that it is better to know everything well, but whether employers set such requirements or you yourself choose a job, in the requirements for a vacancy in which there is the OS in which you "rummage".

Answer 1

It all depends on the infrastructure of the employer and the tasks to be solved. It’s better to know a little bit of everything + delve into the direction you encounter at work.

Answer 2

With Linux, of course, it is more interesting, but you also have to be friends with Windows. In general - kmk - the main thing is to be able to think and use the search correctly :)