Does this teach all that is to c++?

Answer 1

No, it teaches the basics though.

Answer 2

no

Answer 3

I've not even gone through it yet (edit: I have now), but definitely not. C++ is a *very* complex language with far more than can be taught in a few hours of lessons (that's about how long each language course is taking me so far, so I figure it'll be about the same). SoloLearn seems mostly concerned with teaching the basics and beginnings of some advanced stuff so that we can get kick started in a language, it's not really meant to teach us everything.

Of course with the code playground and discussions such as this there is a lot that users can learn from each other, but not everyone will participate, and not all possible usages of any functionality of each language will be covered in the playground or discussions.

In the end SoloLearn is an awesome idea, but it's not yet mature enough to be the end-all-be-all place to go, and realistically I don't think it or any other site ever could be because programming languages and the tech they are ran on is constantly evolving, just as are we the devs (hobbyist or otherwise), and with such a consistently changing environment just as it can be hell to keep up from a learning perspective I imagine it's also not simple to keep up from a teaching perspective.