Pretty good guide covering Keybase features as well as PKI, OpenGPG/GnuPG, encryption/decryption, signing,authenticity/integrity and generic security & privacy guidelines average human beings can understand. Thumbs up, Keybase, going to take off in 2020?
Not unless the product evolves to be more than a Slack + Dropbox + GitHub clone with E2EE as the only differentiator, or they convince people that E2EE is worth trading for a weaker UX and feature set.