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A comprehensive community guide for configuring YubiKey as a hardware smart card for GnuPG cryptographic operations including encryption, signing, and SSH authentication. Covers the full setup workflow: preparing a secure Debian Live environment, generating a Certify key with Signature/Encryption/Authentication subkeys, backing up keys to LUKS-encrypted storage, transferring subkeys to YubiKey, configuring PIN policies and touch requirements, and using the YubiKey for SSH, Git commit signing, email encryption, and agent forwarding across remote hosts. Includes instructions for Linux, macOS, Windows, WSL, and OpenBSD.