It’s arguably a good idea to move your SSH listener off port 22. This is a quick and easy way to reduce hacking attempts and one of the first things you can do to further secure your server.
Your web server may be ticking over nicely and everything looks fine and dandy. However, unbeknownst to you your server could be under constant attack by hackers! How can you find out if this is happening? One of the first things to check is your SSH log.