For more information about data types, field sizes, and input masks, see the article Introduction to data types and field properties.
You can define validation rules for table fields and for controls on forms.
The user can type in any combination of letters or numbers in response to the question.
The label will display as the title of the field or the question that is being asked on the form.
For example: a Textbox field with format validation set to Numeric will require users to enter only numbers.
A good place for this is the additional instructions section of your question title.
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A Textbox Field is used to collect free-form, text-based responses.
For example; you can require users to enter either "abcd" or "ab cd" using the following expression: ^(ab) ?
By default, if you type something in the Text Box, the value will be propagated in the viewmodel when the Text Box loses its focus.