explanation of gridview in flutter code example

Example 1: gridview flutter

GridView.count(
  // Create a grid with 2 columns. If you change the scrollDirection to
  // horizontal, this produces 2 rows.
  crossAxisCount: 2,
  // Generate 100 widgets that display their index in the List.
  children: List.generate(100, (index) {
    return Center(
      child: Text(
        'Item $index',
        style: Theme.of(context).textTheme.headline5,
      ),
    );
  }),
);

Example 2: grid view in flutter

CustomScrollView(
  primary: false,
  slivers: [
    SliverPadding(
      padding: const EdgeInsets.all(20),
      sliver: SliverGrid.count(
        crossAxisSpacing: 10,
        mainAxisSpacing: 10,
        crossAxisCount: 2,
        children: [
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text("He'd have you all unravel at the"),
            color: Colors.green[100],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text('Heed not the rabble'),
            color: Colors.green[200],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text('Sound of screams but the'),
            color: Colors.green[300],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text('Who scream'),
            color: Colors.green[400],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text('Revolution is coming...'),
            color: Colors.green[500],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text('Revolution, they...'),
            color: Colors.green[600],
          ),
        ],
      ),
    ),
  ],
)