A module is used to categorize your lessons into different groups. These groups could be based on topic, subject or goal.
Then select the name of your course from within that Dashboard which you want to add a module to.
Click 'Edit Course' to start editing course contents.
Once you've gained access to your course. Scroll down to the bottom of the course creation page.
Click on the button titled 'Add new module'.
Once you've selected that button a new module will appear at the bottom of the course content. You can now rename that module as you like and drag and drop it to the place where you want it to be.
Click Save to store your changes.