Language/Mandarin-chinese/Culture/Internet-resources-for-learning-Mandarin-Chinese

Free resources for learning Mandarin Chinese. Those mentioned in Language/Multiple-languages/Culture/Internet-resources-for-polyglots are not to be listed again here.

https://ninchanese.com/

It garantees you to be somewhere similar to B2 level.

http://www.hellochinese.cc/

Better and earlier than Duolingo's Chinese course. For pure beginners.

http://www.chinese-skill.com/cs.html

Better and earlier than Duolingo's Chinese course. For experienced beginners.

http://www.archchinese.com/

Comprehensive. It's so good to see tones in such a large size.

http://zhongwen.com/

Dictionary for Traditional Chinese, with trees showing their relations.

https://www.pleco.com/

It's the best dictionary on mobile.

https://www.naer.edu.tw/files/11-1000-962.php?Lang=zh-tw

Mandarin dictionaries of ROC.

https://www.mdbg.net/chinese/dictionary?page=practice

For learning and practicing characters.

http://hskword.com/

For learning and practicing words.

http://www.chinesehideout.com/challenge/

For learning and practicing characters and words. It also provides other options besides HSK.

https://www.duchinese.net/

Free users can only read the newest ones. But there is no better alternative.

Extra: https://map.baidu.com/

It covers parts of the blank of Google Map Street View.