This is a simple example of a form, with multiple controls:
The first text entry field, with default value "test" is here:
The second text entry field, with no default value is here:
Now, here's three checkboxes right in a row:
The thing about radio buttons, is that although they look a lot like checkboxes, you can only select one option at a time:
Selects perform a similar function to radio buttons, except that they are displayed on one line and are hence are more compact and common.
To reset the various elements to their default states, press this button: