Tye, there are a lot of verbs that use prepositions before a following infinitive. You just have to memorize them, because they don't always translate to English. Here's a very short list of verbs that need an "a" before a following infinitive: enseñar a (to teach), aprender a (to learn), comenzar a and empezar a (to begin), ir a (to go), venir a (to come), ayudar a (to help), and many more.
In fact, there was a light bulb at the beginning of this lesson, and if you clicked on it you would have had a detailed explanation of the grammar introduced in this lesson
Where are those light bulbs? I never see them. I always have to go google the new grammar points.
Thank you for responding! Where on the Android version? I have never seen "Tips" or a light bulb.