If you plan to create forms down the road and always want to collect email addresses, you can mark a setting to make this a default. In addition, if you intend to make all questions required or use the same point value for quiz questions, you can set these defaults as well.
Click More on the top right of the form page (next to Send) and then select Preferences. Now in the pop-up window, mark the checkboxes for any or all of these options. This is a great time-saver if you plan to use the same settings on forms moving forward.