Built this entire video on raymarching in shaders using shaders, ray marching, and signed distance functions.

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In this video, I cover ray marching and some of the cool stuff you can do with it in shaders. We cover basic scene construction, unions/intersections/subtractions, doing smooth minimums, normal generation and soft shadows, and anything else that seems kinda neat about the technique.

Ray Marching: https://en.wikipedia.org/wiki/Ray_marching
Great Resource for Ray Marching and SDF's: https://iquilezles.org/
Smooth Maximum: https://en.wikipedia.org/wiki/Smooth_maximum

Ray Marching, and making 3D Worlds with Math