After you've assigned lessons, you will want to follow their progress and keep track of what's still unstarted, what's been completed, what needs your feedback, etc. Fortunately, it's quite easy to do so.
1. Click on the Classes tab (or the down arrow next to it, which displays a dropdown menu).
2. To the far right of each class on the Classes page (below each class in the dropdown), click on Assignments.
3. You'll see a list called "Current Assignments," which includes all non-archived assignments for that class, and which you may filter or sort for your convenience. Click on the dropdown menu under "Filter By:" to see a complete list of assignment statuses.
4. Once you select your desired status, the list of assignments will update accordingly.