A description can be given for any board in the space.
Usually the rules and instructions for that board are fixed in the description, so that they do not have to be explained separately to each team member.
How to add a board description:
Click on the icon with the three dots on the board;
Add Description.
Editing text in Description
You can edit the text in a board description in the same way as in a card description - add headlines, images, videos, code parts, change the text outline, etc.
To do this, click on the purple plus sign in the editor.
It is also possible to edit the markdown - the triple dot icon at the top right.