Cyber threats come from two main sources: insiders and outsiders. Most of the time insiders are working with outsiders, or at least the outsiders have found a way to access the inside information through phishing or blackmail. Insider threats include things like espionage and theft, while outsider threats include various forms of hacking. Almost all attacks are motivated by money, whether directly or indirectly through theft of proprietary information.
Protecting your organization from both insider and outsider threats takes constant vigilance. Train employees on good digital hygiene practices. Identify which information is most vulnerable and then take measures to encrypt it and restrict access. Monitor who is accessing what on your network and be on the lookout for suspicious activity. Make sure not only your employees but also any contractors or outside partner organizations take precautions with BYO devices including smartphones and smartwatches.