All 7 Custom Widgets & Reusable Components questions
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Why should you extract a repeated piece of widget code into its own custom, reusable widget class rather than duplicating that same code across multiple different screens? What is the difference between extracting a piece of widget code into a separate build method within the same class versus extracting it into an entirely separate widget class? How does properly using the child parameter, rather than a builder function, on a custom reusable widget let Flutter optimize rebuilds by reusing an already built widget subtree? How should you design a custom widget's public constructor parameters to make it flexible and genuinely reusable across many different contexts, without becoming overly complicated? How can you build a genuinely themeable custom widget library that automatically adapts to an app's central theme, rather than hardcoding fixed colors and styles directly within each individual custom widget? How can you publish and share a custom widget library as its own separate, versioned internal package, letting multiple different Flutter apps within an organization reuse the exact same set of components?
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How can composition, meaning combining several smaller, focused custom widgets together, help build a complex screen more maintainably than relying on one giant, monolithic widget class?

Intermediate

Answer

Rather than building one enormous, deeply nested widget class attempting to handle an entire complex screen's full layout and logic all at once, composing that same screen out of several smaller, individually focused, and independently named custom widgets, each responsible for just one clearly defined piece of the overall interface, makes the resulting code significantly easier to read, test, and reuse elsewhere, since each individual smaller widget can be understood, modified, or tested completely on its own without needing to hold the entire complex screen's full context in your head at the same time.
Scaffold(
  body: Column(
    children: [ProfileHeader(user: user), OrderHistoryList(orders: orders), AccountSettingsSection()],
  ),
)
Real-world example A profile screen composes three smaller, clearly named custom widgets, a header, an order history list, and a settings section, rather than combining all of that logic into one single overwhelming build method, making each individual piece much easier to test and maintain independently.

Common follow-ups: At what point does breaking a screen into smaller widgets start providing diminishing returns?;How does widget composition relate to the broader software design principle of single responsibility?

Flutter App Architecture with Modular Feature Folders;Widget Testing in Flutter
All 7 Custom Widgets & Reusable Components questions