If you've ever been fired or laid off, you know it can be a traumatic experience, especially if you haven't been given a specific reason. Nobody really ever gets fired without a cause—there's always reason for letting go of an employee.

There are multiple reasons why people are let go (reorganization, underperformance, being drunk at work, harassing co-workers, complaining about your boss on social media, breach of company's policies, etc.), but there are three that are most common in my experience and two of them are almost completely avoidable.