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Craig Hesling
linux4life798
Electrical and Computer Engineering from Carnegie Mellon University
Technical guide for using YubiKey series 4 for GPG and SSH
YubiKey 4 series GPG and SSH setup guide
Written for fairly adept technical users, preferably of Debian GNU/Linux, not for absolute beginners.
You'll probably be working with a single smartcard, so you'll want only one primary key (1. Sign & Certify) and two associated subkeys (2. Encrypt, 3. Authenticate). I've published a Bash function which automates this slightly special key generation process.