Within your lessons, you will now get the option to add short and long descriptions.
Using the descriptions, you can set a better learning context.
You can now explain to your students what the lesson topics will be, and what they can expect from the lesson.
To access the descriptions, open a course and click on a lesson.

Now, add your short & long description in the text box as shown and click save.

Now, your students will see these details within the lesson player. This will give them a better context & help them learn more effectively.

For more course creation tips, you can check the course creation basics articles.