Kanban Board is a tool to help fulfill a list of project tasks
it have columns like “to-do”, “doing”, and “done”
or “waiting”, “in progress” and “completed”
or you can name the three columns by yourself.
you start with edit the board title and adding cards / tasks to the first column on the left.
a card have a description and a list of users.
then you choose one of the cards and drag them in the middle for a status “doing”.
you can reorder the cards and if a task is finished the card move to the right.
via context menu you can gave it other color or some icons.

https://en.wikipedia.org/wiki/Kanban_board