How do I create a good lighting system

What I am looking to do is make a dungeon crawler. I'm really new to construct, and I do not have much experience with programming. Is there a way to make a fog of war lighting system with line of sight based area discovery? I don't know if I described this well, but if anyone is curious and looking for clarification I could probably mess around in paint and create a diagram!

You mean if there a fog the player can't see the enemy?
you can do this simply by making a variable, and if the player inside the fog set the variable to false and when he outside the fog set it to true.