OS X ships with the built-in SSH server disabled by default which is great if you aren't going to use it, but for anyone who tinkers with the OS X subsystem or is looking to become a power user, being able to tap into your machine from afar becaomes a pretty important function.
Here are the top five things you can do to help lock down and lower your risk profile when enabling the SSH server (in increasing levels of complexity):
1) Use strong passwords
2) Change SSH server listening port number
3) Configure AllowUsers & DenyUsers
4) Disable PasswordAuthentication
5) Enable Public Key Authentication
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