Is there a kind of quick start for a sysadmin?

Question

System administration

Hello, I'm a web programmer and all my knowledge comes down to mysql, php, javascript, with the latter, by the way, I'm not very good at it. Then a job turned up in the tax office, only as a system administrator. Nobody wants to go anymore, everyone who knows something and worked there, some left for Moscow, then somewhere else, but our city is small and the salary is appropriate. As far as I understand, there will be a lot of work, but I didn’t have time to ask about my duties and I don’t even know what knowledge you need to have in order to fulfill your duties in a quality manner. I worked in a provider company, repaired computers, I can quickly identify problems, and so on. I know very little about networks, as far as I understand, this is exactly what I will be doing there. Actually the question is in the title. is there something like quick start? So that I can maintain all the equipment and the network until I upgrade my level? According to the previous problems, they happen often, but it was not possible to find out which ones again.

Answer 1

Depends on the hardware manufacturer.
You might want to try getting started with the Linkmeup article series: Networks for Kids.

Answer 2

CCNA, and "networks for the smallest" is just that.