Here is a nice tutorial by Oscar Armstrong-Davies.
Check out a great quick video by Oscar Armstrong-Davies that explains how you can real-time raytraced reflections with Unity HDRP in under 60 seconds. The trick can be used to add an extra touch of realism to different kinds of Unity projects.
First, you need HDRP 7.1.8+ to set up everything up. Enable DX12, then turn on raytracing in project settings and add Recursive Rendering to your post-processing stack. The next step is creating new material, then setting metallic and smoothness to 1. The rendering pass should be set at Raytracing. You now have reflections!