Canceling a class leaves it up on your customer-facing schedule, showing as canceled. This is recommended in situations where you want your customers to know that the class is still happening at the same time, but it will not take place this time around. Deleting it removes it entirely, particularly useful in situations whereby you want to remove it from your schedule entirely.
Note: If you're looking for a tutorial on how to delete a class that's already been canceled, click here.
Also, if you want to cancel or delete an entire series, follow this link.
To cancel or delete an individual class, you will need to navigate to the classes section of your Dashboard and locate the class to cancel or delete. Once in the class, select "Actions ⋮" and pick whether you want to delete or cancel the class.