What are the Russian-language educational sites?

Question

IT education

Please tell me educational projects with online (automatic) checking of answers. Projects like YaKlass, Internet Lesson. In addition to the theoretical part, I am interested in the opportunity to solve tasks and test knowledge with the help of tests.

Answer 1

https://stepic.org/

Answer 2

INTUIT?
In full, they even give some certificates.

Answer 3

here is a great site where you can solve problems of any complexity: https://www.codewars.com/