Farm Administrator – Recommendations on SharePoint 2016 Administration Learning

Traditionally, I've been front-end, I've built out-of-the-box solutions and modified user permissions, but I'd like to step into backend administration, manage server farms, collections of sites, etc. Do you have any recommendations on where to start? What resources did people find useful? Is it convenient and useful to set up a development environment on which to test elements?

Thank you in advance.