How to Create and Give Quizzes via Google Forms covers everything you need to know to create your first quiz, share it with your students, and review your students' responses. The video also shows a student's perspective of taking a quiz via Google Forms and Classroom.
Once you've got a handle on the basics of using Google Forms to create a quiz, you'll probably want to learn more. Here are some additional Google Forms tutorials to help you.
Score Quizzes That Have More Than One Correct Answer
How to Require Complete Sentences
How to Combine Google Forms
How to Create QR Codes for Google Forms