How do I change the order in which lessons / modules appear on the student homepage?

By default, lessons are ordered based on when they were first published - the first one to be published will be at the top of the list, the most recently published will be at the bottom.

However you can change the order in which lessons / modules appear on the student homepage by going to Student Work > Reorder. Then click and hold over the 6 blue 'dots' next to a lesson / module and move your mouse to change that lesson / module's position on the student homepage: