Incase I want to develop a site for online education which includes many paid courses delivered via Virtual tutoring (3rd party add-on), what license will be required.
There’s no problem with selling items on your website. A regular license is fine
An Extended license is only needed if you intend to use the theme to develop another item and sell it (the theme, its code, etc). If you are just selling courses, the users are charged for your course’s content, not for using the site, so the Extended license is not needed. You will only need to use the Regular license in this case.
Also, in case you are developing a site for online education, we can suggest you a few best-selling themes for online education below:
or Course Builder
Thank you for this information.