UE4 Game loop?

Hey guys, I switched from Unity to UE4 due to several reasons. I’ve known C++ for a while now and when I came across coding in UE4 I was shocked to not see the game loop? (update method). How do I then do things such as update positions of Actors etc (general gameplay stuff) without this loop? thanks!

p.s: also how do can I access a player controller (mine + others over the network) from the game mode class?

Its called Tick in Unreal Engine naming.