How stages map to board columns

My Tasks and a group's board show tasks in five columns: Backlog, Up next, Doing, In review and Closed. You do not put a card in a column. The “template” does: its Task grid says, for each task and each “stage”, which column the task is in. When the task moves to another stage, its card can move to another column.

One task, at one stage, in one column:

The task grid is part of the template. Its rows are the tasks, its columns are the stages, and each square holds one board column. See Task grid.

Here are Demo Contributor's tasks on My Tasks, with Show finished tasks ticked:

• The same task can sit in a different column at each stage. A task can be in Doing while it is at one stage, and in Closed when it moves to the next.
• A task someone added to a project by hand, outside the template, has no row in the grid. Its stage's own usual column places it.
• A task whose stage has no square in the grid has no column. My Tasks shows it below the columns, under Not on the board, and says “Each of these tasks is at a stage its template gives no column, so the board cannot place it. Ask whoever keeps the template to fill in its grid.”
• On My Tasks and on the Kanban of a record, you can drag a card to another column. A move into Closed can finish the task or stop it: see Move a task on My Tasks. On a group's board, move the task to another stage: Move a task to another stage.