I very recently downloaded Nobara on my PC, which went great. But I only have two (2) 500Go nvme disks and I would like to use both. Unfortunately, my OS is installed on one and the other still had the old Windows partitions. I did clear it completely but I don’t know how to make it accessible to my user. I tried just having a btrfs partition but I couldn’t really use it. Do I need to had a swap on the second nvme too? Or do I need to do something else? Thanks in advance for any answers.
No, no second swap area required - you don’t need to do anything other than format the second nvme drive with a filesystem (sounds like BTRFS in your situation) and mount that entire second nvme filesystem as “something” under /mnt.
You could decide for example, that it was for your games… so you create a directory under mount named “Gaming” and you mount the entire second filesystem on “/mnt/Gaming”… now you have a 500GB chunk of disk sitting there under /mnt/Gaming and whatever you write anything to /mnt/Gaming, it’s going to end up on that second nvme drive. You won’t have any idea that it’s on a different physical drive - it just looks like another directory to you.