Keybase is more than a website. If you're comfortable working in a terminal, you should download the keybase app. You can do so much with it: sign, verify, encrypt, generate messages, sign code, move keys around, etc., all using GPG for the crypto.
Every account on Keybase has a public history. "Sigchains" let Keybase clients reconstruct the present without trusting Keybase's servers. And when you "follow" someone on Keybase, you sign a snapshot of your view of the claims in their sigchain.
Information about Keybase's encrypted chat product.
Our cloud-backed file system is live for all.
Documents describing Keybase's use of cryptography.
Keybase's protocol for external services wishing to be added as proof integrators.
Design, implementation and specification of Teams.
A description of Lockdown Mode, recommended for users who want extra protection for their Keybase account.
A description of Keybase's Stellar wallet implementation.
Linux-specific information about installing, using, and customizing Keybase.