UE4 Ray Tracing Relight learning

I just updated UE4.27. I compared path tracing with RTX GI and SSGI. Nvidia's RTX GI has been improved a lot. Solve the problem of GI disappearing due to low texture brightness, and solve many bugs.
Path tracing is completely dynamic and real-time, it does not have any baking information.
And to turn on RTX GI or SSGI, I need to bake skylight. This is because Skylight's RT shadow effect is not good.

Thanks to Gabro Media for the project file
https://www.unrealengine.com/marketplace/en-US/product/log-cabin