When programming, very frequently we need to store bits of information. We use variables to do this. Believe it or not, we've already seen variables before.

Start this course: https://www.udacity.com/course/java-programming-basics--ud282

Finish all of Lesson 1: Variables and Data Types. Remember to try out the code in Android Studio as well.

Try: Do the Lesson 1 Problem Set, at the end of the lesson.