You should learn MySQL because it is a widely-used, open-source relational database management system, essential for managing and organising data in web applications. By learning MySQL, you'll gain valuable expertise in database design and manipulation, making you a sought-after professional in the tech industry. Furthermore, it is robust, reliable and compatible with numerous programming languages, ensuring its relevance for multiple projects. Finally, learning MySQL will enhance your technical problem-solving skills, as you'll be able to understand complex data relationships and optimise performance.