Thank you Mitch!

I watched a simple tutorial so far: https://youtu.be/_QjHUi6VXV8?t=124

1) Basically every hardware RAID card comes with another kind of interface?
2) Is there any card/interface you would recommend?
3) And do I need to reinstall Linux, or could I just say to the RAID card "Hey, I want RAID 1, start with that disc and mirror it for a while like rsync"?

Sorry for noob questions, but it seems like every hardware RAID card would require a somewhat different setup with a different procedure, which feels confusing.