Methods are functions that are defined in an object. You will be creating various functions soon. If this sounds confusing to you, think of an object as a car. Say the car's name is 'Rock'. Rock has a method called 'forward' that turns the wheel to let you drive forward.
Objects also have 'properties'.
Thus 'bodyColor' and 'interior' would be Rock's properties. One of the properties of the Document object is 'bgColor', which is for background colors. Modify the code in example 1 so that the background of the document is yellow. You may change the text if you wish.