Sharepoint Site Collection gives you the ability to change the URL of your Course easily.
1. Open The Course with the URL that you want to change
2. Go to Site Contents
3. Choose Site Settings
4. In the 'Look and Feel' section choose 'Title, description and logo'
5. Write the needed URL and click save to apply changes
The changes will be saved immediately
Please note that changing the URL does not change the Title of the Course!
To change the title of the Course please write the necessary name in the Title section and click Ok to save changes