What is the equivalent of a “hint” on an Input?

In Flutter, you can easily show a “hint” or a placeholder text for your input by
adding an InputDecoration object to the decoration constructor parameter for
the Text Widget.

How do I show validation errors?

Just as you would with a “hint”, pass an InputDecoration object
to the decoration constructor for the Text widget.

However, you don’t want to start off by showing an error.
Instead, when the user has entered invalid data,
update the state, and pass a new InputDecoration object.

Flutter plugins

How do I access the GPS sensor?

Use the geolocator community plugin.

How do I access the camera?

The image_picker plugin is popular
for accessing the camera.

How do I log in with Facebook?