Functionality testing:
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It is classified as Links, Forms, Cookies, Database

 Links
Internal link, external link, mailto link, Broken link

 Forms
* Field level validation
Check for lenth, special characters, numerical charts etc

 * Final checks
Checking whether the Create, modify, view and delete are working or not.
* Error handling
Check whether appropriate error messages to be displayed.
* Optional and mandatory fields
Mandatory Field should not be left blank and optional field should allow the user to skip the field.

 Cookies
Check whether cookies are enable or not. Websites use cookies to simulate a continuous connection to that site.

 Database
Should not contain wrong or missing data.