Quizzes
From Moodle's documentation site:
The Quiz is a very powerful activity that can meet many teaching needs, from simple, multiple-choice knowledge tests to complex, self-assessment tasks with detailed feedback. Questions are created and stored separately in a Question bank and can be reused in different quizzes. When creating a Quiz, you can either make the questions first and add them to the Quiz, or add a Quiz activity and create the questions as you go along.
We will get into a few things, but the best resource is the above-mentioned site 
maintained by Moodle.