Moodle keeps tracks of user activity in Moodle.  To view information from the Moodle logs, click on Gear Icon (top right of page) →  More → Reports.   There are a variety of reports on Moodle activity that are available.

Logs - reports on all activity within the course

Live Logs - quick report on course activity in the last hour

Activity report - number of views for each activity in the course.  Does not include any user information.

Course Participation - report on if students view or post to a specific activity within the course over the past week.