When you ask 'how to create a course', are you wanting to know how to create a course shell — the space wherein you will deliver your course, including its content? Or, are you wanting to know how to setup a course —within an already-created course shell?
If you you are wanting to know how to create a course shell, there are a number of ways to do this in Brightspace, including:
To give you the most meaningful instructions, I'd need to know what process courses are typically created using in your organization, as each of the aforementioned methods have a different workflow; some of which may be restricted to users of a specific role (i.e Administrators).
Having said this, I'm sharing here some links to some how-to videos that shows:
Note: for additional how-to videos, I recommend you check out our Brightspace Tutorials channel.
I hope this helps!
Learning Administration Manager