A list is a collection of vertically-arranged cards. They may represent a collection of ideas, things to remember, or the different stages of a workflow.
You can start with creating three common lists such as: To Do, Doing and Done. You can customize and move Lists in many ways. During the creation of a Board, the three default Lists will have the following roles: To Do = Not Started, Doing = In Progress, Done = Completed.
All lists are equipped with information on how many Cards are belonging to them as well as how many tasks and sub cards have been completed/uncompleted.
Example: a board with many lists.