Another tip: change the port of your ssh server. This makes connecting a small bit more tedious(create a .ssh/config file on your clients!) But in exchange you

Another tip: change the port of your ssh server. This makes connecting a small bit more tedious(create a .ssh/config file on your clients!) But in exchange you gain much less people trying to hack your machine. This should not be your only security measure though, since its still findable for some people willing to put in the effort (or targeted attacks).