教える is an いちだん (Type II) verb that means both to teach (as in a school subject) and to inform or to tell (as in providing information). In Japanese, telling someone your address or phone number is expressed using 教える because you are imparting knowledge.
That is how Fuguro works. It brings 教える back for review right before you forget it, each time a little later, until it sticks for good. You hear it spoken aloud, and you meet it again in stories you can already read. The first five levels are free.