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Exercise: Direct Lighting
To build up lighting skills, start as simple as possible: ignore all the fancy lighting features of your game engine or renderer, and instead manually hand-place every light source, including any bounce lights or fill lights. This is a labor-intensive "old fashioned" way of lighting a 3D space, but it is a useful exercise to force you to think about what your light is doing. This workflow is also more relevant than you may think; relatively recent games like Fallout 4 feature no precomputed light baking.
Light a simple blockout room with realtime direct lights and hand-placed indirect lighting.
If this is your first time thinking about lighting, texture the blockout with grayscale textures and use desaturated grayscale lighting.
If you'd like more of a challenge, use colored prototyping textures and colored lights.
Disable precomputed light baking, use only realtime lights, consult the lighting page on how to setup a fill light