Ssh

Covers the SSH patterns you actually use: connecting to servers, managing keys, port forwarding, and file transfers with both scp and rsync. The config file examples are solid, especially for jump hosts and connection multiplexing which can save you a lot of typing if you're bouncing between servers regularly. Good coverage of the -L and -R tunnel flags, which I always have to look up. The security tips at the end are brief but sensible, like switching to Ed25519 keys and disabling password auth. It's comprehensive without being a man page replacement. If you work with remote servers even occasionally, this gives you the commands you need without having to dig through documentation.