Each card on a board represents a task and is marked by the same color as the task it corresponds to. On it you can see:
1 Task name
2 Its start date
3 Who it is assigned to
4 Task path
From the card, it is also possible to switch to Task settings 5 in general, or Comments on the task 6 and Attached files 7, in particular. For a quick overview of the task description, hover the cursor over the info icon 8 in the bottom right corner.
You can drag & drop cards between columns based on the categories they are grouped by. Moreover, you can hide columns you do not need to see at the moment by clicking on a minus sign to the right of the column name, or bring them back by clicking on the plus sign near the column name.