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

Through video, text and audio, this course helps you become a better language learner. It also explains many Chinese-specific learning strategies necessary to avoid wasting lots of time or missing ... Read more.

hackingchinese.com

This website and podcast offer theme-based, progressive online audio lessons. There are transcripts, worksheets, mobile apps, videos and more. Not all of this content is free, but the beginning of ... Read more.

melnyks.com

Outlier Linguistics Dictionary of Chinese characters is an excellent tool to help you understand and thereby learn Chinese characters more effectively. It gives you instant access to the latest res... Read more.

outlier-linguistics.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

This website allows you to look up all sorts of things related to characters, including pronunciation in historical and regional varieties, components based on their pictographic origin, and much m... Read more.

zi.tools

This is a digital version of the official authoritative stroke order standard used in China. It is sorted by stroke and is not searchable, so it's a bit hard to use. Thus, other resources will ofte... Read more.

yuke.blcu.edu.cn

This is a presentation by Thomas S. Mullaney about Chinese typewriters through history. In the digital age, typing in Chinese is easier than it has ever been, but how did the Chinese typewrite evol... Read more.

youtu.be

Character frequencies for Classical Chinese (i.e. not based on texts). This resource was discussed in this article: [The most common Chinese words, characters and components for language learner... Read more.

lingua.mtsu.edu