You’re building your app, you’re out on your way, activity to fragment, you’ll add deeplinks one day. Notifications, transitions, you pass arguments, too. Just a messy piece of cake, for a developer like you! But then the user hits back, or up or away — What should happen? You’re lost! The road starts to sway! They talked about launch modes, affinity, activity stack... We will deep-dive to those, then learn the new stuff from Jetpack!