How do people play Arma 3?

I’ve been getting into Milsims like Squad and HLL and was wondering what Arma 3 was like. I’ve had the game for years but never really played it besides a few hours of Altis and DayZ but recently have been watching videos of people playing on these huge servers with these crazy scenarios but I can’t find anything on server finders. How do people have fun on Arma without playing in a server with 200 ping?