ForAdvanced users, Moodle Docs contains a comprehensive set of instructions for the Assignment activity.
Working with Turnitin
Turnitin is a web based plagiarism detection service. The service allows for the submission of assignments to the Turnitin website, which checks for matching text against a database of previously submitted work and other online sources.
Grading rubrics can be set up in Moodle to facilitate criterion based assessment. The grading rubric is extremely easy to set up and can be helpful in improving consistency of marking (particularly where there are multiple markers), and in enhancing the feedback given to the student.