macs don't really use special monitors, it's the same as other windows and Linux pc's
https://www.apple.com/mac-mini/specs/
thunderbolt carries displayport signals and it also has a hdmi so without using a converter you can connect monitors with hdmi and or displayport
if you wish to connect a VGA monitor DVI you will have to use a converter from displayport to said types
Mini DisplayPort to VGA Adapter - Apple & Mini DisplayPort to DVI Adapter - Apple
VGA being the worst way to connect displays though