Organizing Levels

I’m new to UE4 and I am understanding most technical details of how to do this or that but I am wondering how y’all are keeping content organized and manageable. Let’s imagine I was making a game with 500 small levels or maps. Haw can I keep it so a lot of elements are still globally adjustable instead of adjusting 500 times.

Could I move the starting point 5 units left in all maps at once for example. Or with lamps I noticed shadow settings are on each lamp, can I adjust those globally? Or bloom can be set to say 5 in the PostProcessVolume but how can I set it to 1 Globally and then each map can have +1 or -1 or +0 to the base value?