[OFF-TOPIC] Are there more platforms like sololearn that you folks know and use?

Question

Sololearn is a fantastic platform to learn, get certified for free and make connections with people who came here with same interests. I love it and was wondering if the people who use this also use other platforms that will possibly have android courses or maybe more programming languages.
I use memrise for learning German as my fifth language, I know the app is great and I'd recommend it to everyone for human languages. Duolingo is also good.
I use memrise as a writing platform.

Answer 1

You are welcome😊

Answer 2

Thank you folks very much

Answer 3

I don't know resources that may be similar to SoloLearn, but it's worth to try this:
https://www.tutorialspoint.com/index.htm
https://www.freecodecamp.org/

Answer 4

For programming, I also use studytonight and geeksforgeeks. To find answers to questions, I use stackoverflow
For general purpose, I use Quora a lot.
And about that language part, I too use Memrise and Duolingo in combination to learn Russian but recently I'm not actively learning Russian.