Hi Anderson! Trello doesn't have a native "share single card" feature for private boards, but there is a reliable workaround.
The best way is to create a separate "Shared" board and invite the person there. Then, use a Mirroring feature (via automation or a Power-Up) to sync that specific card to the new board. This way, the person only sees that one card, and any updates you make on your main board will automatically sync to their view.
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