What is Coinbase earn?

As a seasoned individual in the realm of cryptocurrency and finance, I often encounter new platforms and services that aim to enhance users' experiences. One such service that has piqued my interest is "Coinbase Earn." Could you elaborate on what Coinbase Earn is and how it works? I've heard it's a way for users to earn cryptocurrency through educational content, but I'm curious about the specifics. Is it available globally? How does one qualify for the earnings? And most importantly, how secure is this platform? As a finance professional, I'm always looking for legitimate and safe ways to grow my portfolio, and Coinbase Earn seems to be a unique offering.