Small games and cut features

So, I’m getting used to working with unreal.
However i’m wondering how i can cut down on game size.
I’ve only just discovered that making a master material “Unlit” means i can skip lighting a scene and save on resources.
Another one was not having starter content or atleast removing as much of it as possible.
Do you folk have more tips like this to make my games as light as possible?
Maybe another trick to cheaply “light a scene”