Answers for "flutter column take full width"

container width full screen flutter

width: MediaQuery.of(context).size.width,

add fit to column flutter

Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: <Widget>[
        Image.network("Your image url",
          width: double.infinity, 
          fit: BoxFit.fitWidth,
        ),
        Text("Fitted image"),
      ],
    )