Changing Job and Network Environment to Linux

Short post:

I'm 24 and I recently accepted a new position at company where the environment is primarily Linux based, but here's the problem. I've worked primarily in K-12 IT as a network analyst for the last 2 years and my school districts environment really doesn't utilize anything Linux related other than an ubuntu VM in a sandbox server we setup as a test environment so I do not have much Linux experience.

Now, my new employer knows this and I believe I am going to get the support needed to learn Linux on the job as I start working with my counterpart, but I wanted to be a bit more pro-active and get a jump start on things.

Does anyone recommend some good YouTube series or training modules that I could look into before starting the new job? Thanks a ton and sorry if this isn't exactly the post for this sub.