Duolingo is a very popular language learning app/website for kids and adults alike. When you learn on Duolingo, you earn points, and we call them experience points, or XP for short. You can earn XP in various ways: Individual lessons = 10 XP (+possible bonus XP) ... Skill Test-out (when you tap the key icon to level up in a skill ) = 20 XP. Checkpoint Quiz = 50 XP. Mr. Tarchine's students are expected to gain 100 XP per week, in addition to any other homework assigned.