you can use virtual box and create server and desktop environment on centos. To understand server admin works i would recommend redhat certification courses. Good luck.
You must have got your answer by now. Additionally you can use locate command also to find files.
https://www.tecmint.com/linux-locate-command-practical-examples/
This link may help you. Good luck.
Good noon all, I was curious to know which Linux OS you use for your server works. I personally work on cent os. What according to you is the best OS for server related works?