HLSL vector and matrix per-component 101

https://docs.microsoft.com/en-us/windows/desktop/direct3dhlsl/dx-graphics-hlsl-per-component-math

Vectors and Matrices and the various ways we can use the notation.

DirectX coordinate systems

https://docs.microsoft.com/en-us/windows/desktop/direct3d10/d3d10-graphics-programming-guide-resources-coordinates