The chart shows how many cards are created and made by you weekly or monthly.
The X-axis is the periods, in each period the first column is the cards that were created or came to your board, the second column is the cards made.
Cards in a column can be grouped by type, track, size, owner, customer, and custom fields. Exception - you cannot group by fields such as "Multiselect" and "Multiline string".
Thanks to this, you can build a graph that displays exactly what is important to you. This means it is more convenient to monitor the workflow and easier to track problems.