u/nuzierg

I bought a terramaster NAS with 6 bays for HDDs and i think 2 nvme ports, since prices are crazy right now I wanted to start as small as possible since I dont have need for that much storage yet. However, with only one HDD i wouldnt get any redundancy and I read something about how you need to start with a reasonably big pool of storage because of how zfs works so that I can more easilly expand in the future.
Is that right? Did I get something wrongs?
Any tips for begginers would be greatly appreciated, I have a few years of linux sysadmin experience but never touched a filesystem that wasnt ext4 or TrueNAS.