This document provides an overview of best practices and common pitfalls for mergers and acquisitions (M&A). Only 20-30% of M&A deals create value, yet they remain popular due to cognitive biases. Historical data shows that small, related, cash deals with a strong acquirer are most likely to succeed. Poor strategic fit, illusory synergies, overpaying, weak due diligence, and failed integration often lead to value destruction. The keys to M&A success are a clear strategy, aligned thinking throughout the process, and healthy skepticism.