ESET, the security and antivirus software provider, has released a short security Ebook entitled 'Social engineering handbook'. Its worth keeping up to date on this information even if it isn't new to you. It good to refresh your thinking on the topic. Security should be a perpetual focus.
Staff/User education is an important part of security also (...and they love it)
Get it here: https://digitalwelcomemat.com/files/ESET_Social_engineering_handbook_v6.pdf