There is extensive documentation for ACF here http://www.advancedcustomfields.com/resources/ that includes general code examples for all of the functions in ACF.
The value returned by get_field('field_name') is generally a single value that was entered by the user or could be something else depending on the field type and what you’ve set it to return. You’ll need to give more specifics about the field, how it’s set up and what it is you’re trying to do or display.
