I've moved all my home bulk data storage to ZFS (https://openzfs.org/wiki/Main_Page) over the last month. (If you haven't used it, it's awesome. More than you're thinking. More than that. It's worth learning.)
So, I'm in deep-learning mode and sometimes get stuck, right? *Every* time I get stuck or confused about something in ZFS there is a Klara Systems article which explains things clearly and with technical rigor. Love it. Huge thanks to Klara folks for sharing their expertise so widely!
https://klarasystems.com/articles/?topics=zfs