It allows teachers to register and offer their courses online. Sastre is equipped with an extensive course system that allows teachers to upload all their materials to the platform and offer them for free or at fair prices.
Students or interested persons can register and conduct all available courses online. There are meaningful certificates for certain courses.

To facilitate the search, an extensive search engine is integrated, which allows the user to find the courses according to his needs. 
Online support, ticket systems and an extensive online library are also part of this platform.