This is the best overview of spaced repetition research I have seen online or offline. It's thorough, well-argued and probably covers more than you were looking for. It's not specifically about Chi... Read more.

gwern.net

Just you try designing 13,000-plus intricate character shapes that all have to balance one another. Read more.

qz.com

Explode Chinese characters into their building blocks; visualize and remember how they are formed. Read more.

characterpop.com

This is a Q&A page where teachers answer questions about Mandarin, mainly vocabulary use and grammar, but sometimes other questions as well. It's mostly useful because of the wealth of information ... Read more.

hwjyw.com

HiNative is a Q&A site where you can ask people all over the world about culture, language, anything. We support over 100 languages. Read more.

hinative.com

Follow this Twitter account to get a new animated Chinese Idiom (Chengyu) in your Twitter feed every day. Characters are Simplified Chinese, pronunciation is Pinyin (coloring is [Hanping's](http://... Read more.

twitter.com

This blog provides in-depth explanations of some grammar and vocabulary topics in Mandarin Chinese. While there aren't a huge number of articles so far, there are enough to issue a general recommen... Read more.

mandarinfriend.wordpress.com

Have you ever wondered what a small 二 or weird symbols that look like 〻 or 々 mean in Chinese handwriting? These aren't characters you normally find in printed books, but they do exist in handwritin... Read more.

en.wikipedia.org