What does a novice system administrator need to know?

Question

System administration

They invited me to work as a system administrator in a training center. What does a novice system administrator need to know?
What is?

1. iMac in the amount of 20 pieces (so far)
   
2. Windows computers, laptops in the amount of 10 pieces (for now)
   
3. Office equipment (printers, scanners)
   
4. Local network (I suspect that the network was built by beginners)
   

I am interested in the following questions:

1. How to properly organize unified monitoring for poppies / Windows (a single control panel remotely. Tim weaver, hello?)
   
2. What software would you recommend to use? It is possible to sit from a poppy and from Windows.
   
3. How to properly inventory all equipment so that there are no problems in the future? (maybe some software?)
   

Also, I will be very grateful if you share your experience, give your advice :)

Answer 1

Are you alone and completely inexperienced? Look for a job with a mentor. Without it, you won't learn much, and you'll probably screw up a lot.

Answer 2

How do you imagine a job without knowledge and experience. It is advisable to first find a place for an internship.

Answer 3

There is software for inventory .

Answer 4

A novice administrator needs to be able to use a search engine (learn to ask the right questions), find and analyze information. Well, read books: on networks - from cisco and SDSM, on win - from MS (there are free basic ws2012r2 administration courses on the Internet), on Linux - Evi Nemeth Unix and Linux system administration. The basic theory has been relevant for quite some time, but it's even better to try everything in parallel (in the laboratory) in practice and figure out how it can help in a combat environment. It will be good to start work not alone, but in a department with admins.

Answer 5

Remote admin - Teamviewer. True, he can work out and drop the session in a couple of minutes, you can buy a license.
There are two users on Windows: the usual one, under which people will work, the second is the admin, this is your user, under which you will install programs for them and make changes to the system. For each computer, generate and store passwords (user and admin, as well as a laptop serial number and some other information) in some password store, such as 1password. In the bios, remove the boot from the USB flash drive and over the network. Set a bios password.
On poppies, it's easier - you can give admin access to users there, Windows is more dangerous in this matter - they can put all sorts of garbage.
There are enough tools for monitoring, there are a lot of articles on the same hub, it is important to understand what you want to monitor and why.
According to the inventory - go through once, manually write everything into some Google table, then keep it up to date or, as mentioned above, use software.