WooCommerce Subscription Product
If you like to sell the classes / courses individually, you can choose the product in “WooCommerce Product” option.
If you like to sell the classes and/or courses in bundle, you have to choose the “WooCommerce Subscription Product” for each and every class and course in that package.
So that when user purchase that product from product single page, than user will get access to all the Class and/or Courses in that package.
Watch following video for better understanding