When you run out of time, better to know that the system works rather than that all monitor resolutions safely render the main pages. Boundary Test From Reasonable to Extreme You can't just verify that an application works correctly if all input and all actions have been correct. People do make mistakes, so you must test error handling and error states. Move through expected bad values because if those fail, the system isn't ready for testing. Then start hammering on the form logic with extreme errors and crazy inputs in order to catch problems that might affect the site's functioning.
Good Values Enter in data formatted as the interface requires.
Include all required fields. Do not try to cause errors. Some invalid data entries are intrinsic to the interface and concept domain. Every form that specifies some fields as required should trap for those fields being left blank. For example, people will inadvertently enter in trailing or leading spaces into form fields.