Site of courses on programming with practice?

Question

IT education

A couple of years ago I accidentally wandered into a site. Now I want to find it:
1) On this site, it was possible to disassemble the basics of popular Japanese from scratch. I remember exactly, there was a slave, a python, Java, etc.
2) The courses were NOT presented in the form of videos or articles.
3) A "terminal" was immediately available, on which a simple script could be executed. The lessons themselves were simple tasks (which had to be completed immediately in the terminal) with explanations.
Who has a guess? :)

Answer 1

maybe it 's https://www.codecademy.com ?