 What are blocks? As a teacher, you can add blocks to the sides of your main learning area. Here there are blocks only on the right, but it's possible also to add blocks to the left or to both sides of your course page, such as here, depending on your theme and administration settings. Blocks are elements which add extra information or learning content to your course. Individual users can usually hide blocks by clicking the icon and then by clicking the plus icon to open them up again. And it's important to remember this in case your learners get confused. With some themes, such as this theme, it's possible to move blocks to the side in a narrow tab. The navigation block here has done that, and it's called docking. To dock a block, you click the icon next to the hide icon. If you do this, it's important also to remember that the blocks have been docked so that you, or your learners, don't get confused. This is an individual setting. To undock them, click them and then click the undock icon, or if several blocks have been docked, you can go down to the bottom to undock them all. More recent Moodle themes are responsive, and that means that when you have a smaller screen size, when you're looking on a device, such as a smartphone or tablet, the blocks are actually moved down to the bottom of the screen, as you can see here. As a teacher, if you want to add extra blocks, you click the turn editing on button top right or scroll down to administration and click the turn editing on link. And this then gives you editing options for each of the blocks, where you can remove them if you don't need them, for example. However, the administration block and the navigation block don't have that x remove option, as they must appear everywhere. And if you see other blocks without the x remove option, this is because the administrator has fixed them throughout the site. Some people call that making blocks sticky. To add a new block, you go to the add block dropdown and select the block you want. And we'll take a look at some blocks in the next videos. Blocks can also be moved simply by dragging them into the place you wish to move them to, or clicking on them, and then choosing the area to relocate them.