I keep seeing buttons called Learn More.

That's a good question. The 'Learn More' buttons are help buttons, which, when they are clicked on, reveal details, designed to help you in SafetyWallet. The details revealed will relate to the section below the button and each button works on a 'toggle-on, toggle-off' principle, where the 'toggle-on' reveals information and the 'toggle-off' hides the information: