Descriptive Error Messages
Tried signing up, I inputted my last name (which includes a dash since it is a double-last-name), I submitted, but I was encountered with a generic validation error message.
I had to check the response message from my inspector mode to understand that I needed to remove the dash from my last name.
I remember running across something similar in a different area of the platform. I suggest you work on that as it could deal a blow to your user experience!