The quizzes are all quite short--4-5 questions--and cover only the material and skills most important for core learning goals. They are designed with students' self-assessment in mind: they can take a quiz twice, and see correct answers. Quizzes are designed to take no more than 10 minutes, so a full tutorial experience (video and quiz) should take only 15 minutes or less.
The default is set to "practice quiz," which means that when you import a quiz, it will not be added automatically to your Canvas gradebook. If you want some oversight over the quiz, you can see practice quiz results via the gear icon in the upper right corner of that quiz. One imported, you are also free to update and alter the quiz, such as changing it to graded. More info on Quizzes.
Import a quiz the same way you would a video: Go to Canvas Commons, switch "Show Public Resources" off, click on a quiz resource, and use the gray import box to select courses and import.
If you want to change the settings on a quiz that you have imported into your course, click the quiz title, and the quiz will open to its summary page, where you can review the description, quiz type, time limit, and many other settings. To edit, click the "Edit" button.
You can edit as much or as little of the quiz as you'd like. However, it's probably a good idea to leave the quiz content as it is, and edit only the settings, which appear on the first tab by default. Adjust the description, time limit, quiz type, and any other settings that might make the quiz more suitable for your course and students.
