Hey there, there are many topics about this, but I’ll show you some examples and topics about lighting!
First off, there is a tutorial on how to do both shadows and lighting on the forums, Lolaphobia made a post about this and it shows how to adjust the atmosphere around you and environmental lighting as well.
If you want shadow map into your game, go to Lighting > Technology > ShadowMap
Links:
Second, there were some new updates that got added to ROBLOX studio with the lightings property! You can add the Atmosphere
Links:
If you want the effects, go to Lighting > Insert Object > Atmosphere/DepthOfField.
That’s all I have for this topic, hope you can find useful things to help you out!