While we have many cyber security training resources available, we highly recommend clients use a service like KnowBe4 to help train employees on how to spot social engineering and phishing scams. We are a partner with them and can run phishing simulations on an ongoing basis. You can request a free Phishing Security Test here, or contact your Client Success Manager and we'd be happy to show you how it works.
There is a cost associated with it, which can be well worth it in preventing attacks. You would also get access to tons of other pre-made training videos and articles. Here’s a link to an article we wrote with more detail about the program: How Email Security Awareness Training Protects Against Phishing Scams