ADB & Frida Basics

Before you reverse a single byte of an Android app you need two things working: a shell into the device, and a way to reach inside a running process. adb is the first, frida is the second. This walks the wire adb actually speaks, the handful of commands you will use every day, how the frida client/server pair injects into a live app, and a first hook that changes what an app does without touching the APK.