For complete beginners looking to get a good conceptual understanding of what shaders are actually doing, I would highly recommend this course: https://github.c

For complete beginners looking to get a good conceptual understanding of what shaders are actually doing, I would highly recommend this course: https://github.com/ssloy/tinyrenderer https://github.com/ssloy/tinyrenderer In the course you will build a purely CPU-based renderer that simulates the way OpenGL shaders work. I found it to be incredibly useful for understanding shaders.