The following are several online communities or platforms that can help college teachers share experiences, learn from each other, and promote collaboration and innovation:

University micro-course library: University micro-course library is a platform for higher education micro-courses sponsored by the Ministry of Education, which can provide micro-courses made by college teachers to enjoy, watch and download.

MOOC platform: MOOC(Massive Open Online Courses) platform allows college teachers to make and share their own courses online and share their knowledge and experience with learners around the world.

Zhihu: Zhihu is a social platform based on question-and-answer and sharing, where college teachers can share their experiences and opinions, learn from each other and communicate with each other.

Douban Group: Douban Group is a community based on hobbies, where college teachers can create or join various groups, share experiences, resources and opinions, and exchange and learn from like-minded people.

wechat WeChat official account: many college teachers will create their own wechat WeChat official account, share their experiences and knowledge, and interact and communicate with readers by publishing articles, information and opinions.

These platforms can help college teachers share experiences, learn from each other, promote collaboration and innovation, and enrich teaching content, improve teaching level and innovation ability.