Starting as a Linux Systems Admin, best things to learn?

I recently accepted an offer to be a full Linux sysadmin. It's my first sysadmin gig and it's at a place with a huge environment with a decently sized team. I'm wondering what else I should push to learn before I go in so I can be as useful as possible. So far I've covered Puppet, Bash and most other RHCSA level tasks. I've had a lab I've been tinkering with along the way as I'm learning as well. If there's anything I've missed or any useful learning material/concepts feel free to plug it below, thanks!