How do I bold (or format) a piece of text within a paragraph?

You should use the RichText widget.

A RichText widget will take in a TextSpan widget that can also have a list of children TextSpans.

Each TextSpan widget can have a different TextStyle.

Here is the example code to render:
Hello World

var text = RichText(
  text: TextSpan(
    // Note: Styles for TextSpans must be explicitly defined.
    // Child text spans will inherit styles from parent
    style: const TextStyle(
      fontSize: 14.0,
    children: <TextSpan>[
      TextSpan(text: 'Hello'),
      TextSpan(text: 'World', style: const TextStyle(fontWeight: FontWeight.bold)),

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