Multilingual online learning site

An online multilingual learning site that supports 18 common languages, including Mandarin Chinese. Go to the website, select the language you want to learn in the grey section at the top, and then you can see the alphabet, numbers, words, grammar and pronunciation provided by the volunteers of the website, using graphic pictures and standard pronunciation to let you start from the simplest and most basic things like a beginner. And you can volunteer to help people around the world learn their own language.