The My Cards Widget provides a way to visualize and manage work you are 'assigned' to.
Cards that you may have an interest in you can simply assign to your self. (ScrumDo allows multiple assignees.) And it will simply show up in your personal dashboard.
You are able to sort cards in a few different orders
Due date sorting allows you to sort by urgency of due date field that is on the card.
Aging sorting allows to sort by how long the card has been on the board.
Points allow you to sort by the points field on the card. Typically use for sizing.
The edit icon allows you to manage the card directly from your My cards widget.
With the edit capability available directly from your personal dashboard, you can move the card on the board to done without actually going to the board for eg.
Or in general update any field of the card.