I just updated to v12 from v11. I also deleted the thousands of cards tagged DELETE and Potential Duplicates. There are still 300+ cards that exist in both Step 1 and Step that are tagged v11. Can I delete these cards? These cards are not found in v12 and I just want to make sure I am not losing information by deleting these cards.
Yes you can delete them, if they are not on ankihub then you don’t need to worry about them.