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These are styling that can be defined by CSS. You can check this reference on how the padding, is displayed on an element: http://www.w3schools.com/css/css_boxmodel.asp
For padding, here's a link to check: http://www.w3schools.com/css/css_padding.asp
Height refers to the actual height or vertical length of the text box or element.
Width refers to the horizontal length of the text box or element.
Form width is the total horizontal length of the actual form.
Input width, the actual horizontal length of the input box.
I would strongly suggest checking our video tutorials in this link on how to use the Form Designer Tool: http://www.jotform.com/help/300-Form-Designer-Tutorial-Let-s-create-fantastic-forms-. The styling can be much more easily understood while working on the actual Designer Tool. If you have questions on this, please feel free to reply on this thread.