Here's just one site with many threads
https://www.google.com/search?q=sued+in+small+claims+court+n...
In my case I found out I'd been sued after the wage garnishment, oddly enough my check was 666$ that pay period which was considerably less than it should have been, I immediately told my manager, she told HR, HR pulled me into their office and informed me my wages were garnished. I then had to search the state court records to find that Capital One had sued me 3x via "bowman & heintz" and a quick google query shows it's quite common for people to have been sued, and never received a summons, by that shady 'law firm' with an alarming number of default judgements awarded because the person never knew.
If I pull up the court records for the cases they do not even state when I was served, or if I was served. Just that a hearing was scheduled, a bench trial was commenced and default judgement awarded as I failed to appear.
Welcome to life for many people.