This app was mentioned in 2 comments, with an average of 1.00 upvote
As far as the basic Indonesian vocabulary is concerned, you could use flashcard apps like the Beginner Indonesian app and the StartFromZero_Indonesian app to learn on your own some commonly used Indonesian words and phrases from scratch.
You may want to try out Beginner Indonesian app. https://play.google.com/store/apps/details?id=com.shex.beginnerindonesian
Good luck!