My grandma just gave me her old MacBook Pro (MacBookPro11,1 A1502) and, after removing a spicy pillow, air dusting everything, and copying off her old photos, I’m ready to do a clean install.

I would like to dual-boot either Linux or BSD (which will be my main partition) alongside macOS (which will be handy for testing and for use with certain peripherals; either Mavericks, High Sierra, or Big Sur).

I am already well-versed in unix-like operating systems, so I’ll only start having trouble if I try to use a source-based distro (e.g. Gentoo, Source Mage, LFS, etc.)

Can I have some recommendations for the Linux and the macOS version, please?