Great for polls/surveys, quizzes, and more!
There are any types of questions you can include - short answer, paragraph, multiple choice, etc. Google will grade multiple choice, checkboxes, dropdown and short answer questions for you!
If you add a file upload question, students can include photos, etc.
In settings, Quizzes tab allows you to make the form into a Quiz, modify when students can see answers/scores, etc.
Pro-tip - ask for their name at the beginning on the quiz so you can give them points.
The three dots on the bottom corner let you do response validation! It will give students hints if they get the question wrong so they can correct before submission!
Flubaroo add-on for Sheets adds additional grading options. You need to take your quiz first as an answer key (and it's a good idea anyway because it helps you catch any errors in the quiz creation).