Type a card title, choose its column and press Add. Use the arrows on each card to move it along the board and the cross to delete it — everything saves automatically.
Each card has arrow buttons that push it one column left or right, so a task flows To Do to Doing to Done with a single click. Buttons are used rather than drag-and-drop so the board works identically on a phone screen.
No. This is a personal board stored in your own browser with no server or account behind it, so nobody else can see or edit it. For shared work, export the board as text and paste it wherever your team already collaborates.
Yes, if you clear site data, use a private window, or open the page in a different browser. Because there is no cloud backup, export the board to text whenever it holds something you would hate to retype.