Without scripts, you'll need a picture that is black everywhere but where the light is supposed to be. That area has to be transparent.
Then you need to show that picture with a show picture command in the maps where it should be dark. Depending on how that picture should work, it might need a parallel process to update the display.
A directional light is theoretically possible without scripts, but it will take a much more complex parallel process to check the walking direction and move and rotate that "flashlight" - I suggest you start with a circular torchlight before trying a directional light.
(in my opinion, video tutorials are a bad way to learn more complex parts, you need a written tutorial to work through if you want to learn more complex forms of eventing)