Microsoft has published the engineering specs for various DirectX features as a supplement for the official API documentation at a level of detail that may be more useful to expert developers. The specs are pretty extensive and include rendering topics such as:
- DirectX Raytracing (DXR)
- Variable Rate Shading
- View Instancing
- Conservative Rasterization
- Rasterizer Ordered Views
- Programmable Sample Positions
- Depth Bounds Test
There is also some detail on CPU efficiency and render passes, among other topics.
View the specs at https://microsoft.github.io/DirectX-Specs/.
