Services like lingualeo for math or programming?

Question

Software and Internet Services

Actually a subject.
Tell me, who knows?

Answer 1

So this is codeWars, codeSignal, leetCode, codecademy, well, the closest thing is probably freeCodeCamp.
It’s convenient to use algorithms https://visualgo.net/en

Answer 2

SoloLearn perhaps, but even then, far from what I think

Answer 3

https://javarush.ru/