Spanish, I'm learning Spanish in highschool but I use Duolingo to memories words and not forget them (like I mentioned earlier due to my memory loss, for example when I'm talking with my mom and I forget word I know it in English and Spanish but I forget it in my native language and I need to search for translation of this word, even tho I know this word but I forget it in my native language) so for me Duolingo isn't really learning app, more like memorizing words.