All 7 Hero Animations & Page Transitions questions
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How does the tag property on a Hero widget genuinely and uniquely identify exactly which specific widget on one screen properly corresponds to a genuinely matching widget on an entirely different destination screen? How can you properly customize a Hero animation's own specific flight path and behavior using a custom flightShuttleBuilder, rather than simply relying entirely on Flutter's own default built in animation behavior? How do you properly create a genuinely fully custom page transition animation in Flutter, beyond simply relying entirely on the platform's own default built in slide or fade transition, using PageRouteBuilder? How can you properly combine a Hero animation together with a custom page transition, ensuring both effects genuinely work correctly together as one single unified, seamless overall screen transition experience? How do you properly handle a Hero animation across a Navigator that genuinely spans several separate nested distinct navigators, such as one genuinely used together with a bottom tab bar navigation structure? What performance considerations become genuinely important when a Hero animation involves a genuinely very large or complex specific widget, such as a high resolution image or a genuinely complex custom painted graphic?
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What is a Hero animation in Flutter, and how does it create that genuinely popular smooth visual effect of a specific widget appearing to fly smoothly from one screen directly across to a corresponding matching widget on an entirely different screen?

Beginner

Answer

A Hero animation creates a genuinely smooth, visually appealing transition effect where a specific shared widget, such as a product thumbnail image, appears to fly smoothly and continuously from its own exact position on one screen directly across to its own new corresponding position on an entirely different destination screen, and implementing it simply requires wrapping the exact same specific widget with a Hero widget on both the originating screen and the destination screen, using exactly the same matching identical tag value on both, letting Flutter automatically handle the entire underlying complex flight animation completely for you.
// On the list screen
Hero(tag: 'product-123', child: Image.network(imageUrl))

// On the detail screen
Hero(tag: 'product-123', child: Image.network(imageUrl))
Real-world example A shopping app wraps each individual product thumbnail image with a Hero widget using that specific product's own genuinely unique identifier as its tag, creating a genuinely smooth, visually appealing flight animation as a user taps a specific thumbnail to properly navigate directly to that exact same product's own detail screen.

Common follow-ups: What genuinely happens if two entirely separate Hero widgets on the exact same screen accidentally share that exact same identical tag value?;Does a Hero widget genuinely need to wrap the exact same identical specific widget type on both the originating and destination screens?

Navigation & Routing in Flutter;Flutter Animations Basics
All 7 Hero Animations & Page Transitions questions