Hi @aybala.isik ,
Welcome to the community!
Generally speaking, deleting is a two-step process - archive, then delete. Archived items can be recovered, deleted items cannot.
Archive & delete a board: https://help.trello.com/article/801-deleting-a-board
Archive & delete a list: https://help.trello.com/article/786-archiving-lists-deleting-lists
Archive & delete a card: https://help.trello.com/article/795-archiving-and-deleting-cards
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