HN user
Extended period without events will weed out firms with responsible supply chains and thus the other type of firms are very likely to be the majority - the majority of the population will depend on them. So Governments will always be forced to bail them out.
DingTalk is a product from Alibaba, which also owns Taobao and Alibaba Cloud. DingTalk celebrated 200 million registered users back in August 2019. So this online course surge is probably not that a big stretch for them.
This is the document got me really understand Git. It's really helpful to know the internals as the surface of Git is too many to comprehend on their own.