What files are included in the /System/Library/LaunchAgents and /System/Library/LaunchDaemons

I bought a used MacBook recently and want to know if it has anything nonstandard like mdm, etc. I have many items invthese folders, such as com.apple.mdmclient.plist, com.apple.managedclient.plist, etc. although I see no signs of having mdm profiles. Is it standard to be included in /System/Library/LaunchAgents and /System/Library/LaunchDaemons?

It is Mojave’s 10.14.4 and I have erased the hardcover and reinstalled the OS.