Tick boxes are displayed alongside some activities. These are a way for you to track your progress through a course.
When you see a box with a dotted tick mark, you can click it to tick the box. (You can click it again to remove the tick if you change your mind.)
These icons are for you to keep track of your own progress, and are entirely optional. If you like, tick the box when you think you've finished something.
Some courses may include blank tick boxes - empty spaces which do not have a dotted tick mark. You can't tick these boxes yourself, but they will be ticked automatically according to conditions that were set up when creating the course website. For example, a resource might automatically be ticked after you have downloaded the file. (You sometimes need to reload the course page to see this type of change.)
Some staff, such as your teacher, may have access to see which boxes you've ticked. However the information is not used in assessment and does not count toward your course mark. You don't need to tick boxes if you don't want to.