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by jwarren116 3614 days ago
In addition to all the really great advice already submitted, I really like using Lynis[0] for scanning my servers to get an idea of obvious vulnerabilities and a baseline for hardening ssh. It's absolutely not a substitute for a security expert, but in about 10 minutes of setup you can get an idea of what action items you need to add to the top of your queue.

[0] https://cisofy.com/lynis/