How do i add a member to a card only not the entire board

[Owner]

I’ve create a board but I don’t want all members to see all the cards on the board. I just want to be able to add the member to a card. Is this even possible?

[Çiğdem Büyükaşik]

Hello @Owner

You can use the Trello Card Share Power-Up to share a card with a member without adding him as a board member and sharing your whole board. This allows you to keep your board confidential and share only as much as you want with others. Give it a try and let me know if you have any questions, 

[Rasmus Wulff Jensen]

No, that is not possible... Everyone invited to a board can see all cards. You can do filtering so you only see your own cards, but that is for usability and not permissions.