Duolingo - the basic idea (aka "crowd-learning") that worked for me
Have you heard about Duolingo (https://www.duolingo.com/)? You didn’t?! Where have you been for last at least six months then? :) Nevermind,...
Duolingo
1
Post
Subscribe to new posts
Processing your application
Please check your inbox and click the link to confirm your subscription
There was an error sending the email