> Run out of hearts, you're restricted from proceeding further in your studies. You must buy hearts to stay on their platform. This is not true. It just means

> Run out of hearts, you're restricted from proceeding further in your studies. You must buy hearts to stay on their platform. This is not true. It just means you made enough mistakes that you should use their practice mode rather than continuing learning new stuff. The practice mode is entirely free and rewards you with new hearts.