Update Jan 14 2021: I updated Opencore to 0.6.5 and MacOS 10.15.6 (Catalina) to MacOS 11.1 (Big Sur). I have the old version as a seperate release.
I installed macOS Catalina 10.15.6. I used the OpenCore Bootloader.
RELEVANT SPECS: AMD Ryzen 5 2600, AMD XFX RX580, ASUS Prime B450 Plus
These files are only a reference, and not guaranteed to work. Please follow this guide: https://dortania.github.io/OpenCore-Install-Guide/