 These are the square objects displayed on the left and the right side of the course page. To add a new block, turn editing on, scroll to the bottom right and select from the drop menu that reads add a block. Some of these blocks will configure automatically, others do need to be manually configured. It's possible to move blocks up or down the course page or from one side of the course page to the other. Blocks can also be docked by clicking the little blue strip. They then collapse to the left side. Blocks can be undocked in a single click.