https://introtorealtimeraytracing.com
I, along with Laura Reznikov from Meta, presented this course at SIGGRAPH 2024 in Denver, Colorado. The course covered the fundamentals of real-time raytracing followed by a step-by-step guide to rendering a simple triangle mesh with DirectX Raytracing (DXR).
The course website will contain links to example code, as well as a recording of the presentation and course notes (once these are available).