# 1.5 Summary + A Note On Chapter 2 Topics

Having a good understanding of class files, XML files, and their interactions is a core skill for Android development. In this chapter, we discussed several of the most common views, and typical ways of adding functionality in class files and organizing them using `ViewGroup` objects. Then, we looked at some of the other resource file types that Android developers typically include in their applications. We will keep seeing ViewGroups again and again so if it seems a little confusing now, they'll become more and familiar soon, just try to master the one you use this week by exploring! On the note of exploration... 

There are also a bajillion more views than the ones discussed in this chapter, which I’m sure you’ll come across in your quest for Android knowledge when exploring. Experience, googling, and trial-and-error will be your best friends in being able to develop some 🔥 applications.