I can’t speak on the purges [probably related to corruption in China’s case], but Xi’s works are mainly speeches but they vary in terms of what they’re about and where they are at.

In some cases they are ribbon cuttiing ceremonies, but in others its general speeches to organizations, universities, etc.

In any case Xi Jinping thought is a genuine refinement of Socialism with Chinese Charecteristics, and Governance of China explains the main goals quite clearly.