[aordano]

Typing this from a MacBook Air 2013 running ArchLinux :)

You just flash the installer of your favorite distro (don't use ventoy) to a USB and install as usual.

[wrycoder]

Do you reformat / partition the drive?

[mixmastamyk]

If you want! I installed latest Ubuntu mate on an old imac for a kid and completely wiped out the partitions with snow leopard stuff.