Proper lighting and shadowing

Straight and simple:

how do they manage to get real time lighting like in these videos

Everytime I make a light dynamic or moveable it starts casting extremely ugly pitch black dark shadows, and nothing is visible in the shadows.

How do you get proper lighting that too which interact with the level objects in realtime and cast nice and realistic shadows rather than ***** black garbage.

You can avoid the dark shadows if you manage the ambient occlusion settings from let´s say 1 to maybe 4. The scene lightning in the videos you can achieve with a Post Processing Lightvolume and make sure you set
also a Lightmass Importance Volume and then play around with these settings.

Hope that helps

It also helps when you have good assets to work from in the first place.