Practice problem: Click behavior

[DaveDibble]

This lesson starts with
1. Before you begin

In this pathway, you learned how to add a button to an app and how to modify the app to respond to a button click. Now, it's time to practice what you learned by building an app.

What is a pathway and where do I find the starting point?

If one goes to https://developer.android.com/get-started/codelabs and selects the checkBox Collection :: Pathways one gets no results found.

Thanks