XCNchinese is a website on which you can learn Chinese online. I think XCN is the "pinyin" abbreviation of the website founder's name .His name is "Xiong ChunNing". But I think if you are a beginner in Chinese ,you should look for a teacher who is intensive in Chinese and whose pronunciation is very standard. After all,learning Chinese on web will be restricted within narrow limits.And You will not know which is suitable for you.