The course index area is on the left side of your screen. Click on the icon to reveal it. Navigate to any section by clicking on the area you would like to view.

The block drawer area is on the right side of your screen. Click on the icon to reveal it. It may show links to activities or announcements, or other blocks you may have added. With the Edit Mode on, you may have extra options, such as editing the contents of a Moodle Book activity. Read more on using blocks in Moodle.