Mergers and Acquisitions (M&A) are incredibly complex operations where two different legal entities become one. It is one of the most important corporate events on stakeholders’ careers, due to their high stakes and complexity, are immensely time-consuming, and is one of the subjects most affected by the theory-practice gap that bothers corporate managers and academia in modern days. Therefore, this work aims to serve as a practical guide to bridge knowledge in business and academia. It relied on heavy and extensive research on the conventional literature in modern finance and behavioural economics and past deals’ documentation. Additionally, real examples were used whenever possible to provide a more relatable feeling in the reader and facilitate conceptual understanding.