Covering what are the most common attacks (eg gift card scams, invoicing fraud, phishing emails), and top prevention methods
Does this exist?
A lot of people participated and personally I learned a lot and had fun doing it.
May require some effort to set up, but then again these may already exist online.
The site itself is clear enough to read on its own, but there are many other sites dedicated to explaining and training around it. It's frequently updated and up to date.