Hi @Steve Platzen - welcome to the Community!
Trello doesn't support granular permissions including the ability to limit users and allow them to only see some cards, not all, on a board. Trello's model is designed to show teams a shared perspective, and if we limited what users could see on a board, they wouldn't have that same perspective.
If you add a user to a board, they will be able to see all cards on that board, not just the one you'd like them to see. If you need to only share one card or a few with a guest, I recommend you do the following:
- Create a new board
- Add them to that board
- Copy the cards you want them to see to that board
However, you may be able to share certain cards/lists using a Power-Up. I recommend taking a look at the Power-Up External Share and see if that works for you - https://trello.com/power-ups/60d93bb780ee244d5d2b1edd
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