By double clicking or by pressing enter and continuing on a new line in the field that you're editing, a '+' icon appears on the left.

By clicking the '+' icon, an icon with a camera and a summation symbol appear. You can add an image to the field by clicking the camera icon and uploading the image from your computer.

Note: images can only be added on empty lines. The picture icon will not show on lines with text (see below).
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When you click the summation symbol you can add an equation to the exercise with a variety of different possibilities.

When you select a piece of text, a mini editor appears. Using the mini editor, you can edit your text, add a bullet list or enumeration and even add a table or type in an equation.

By clicking the button "add additional answers and feedback", you can specify the info about the exact answer that should be given by your students, in order for the answer to be approved.

In the screen that opens you can add multiple answers and provide specific feedback. Select if a specific answer is correct or incorrect and even give specific feedback depending on which answer is given.

To read more about adding additional answers and specific feedback, check out these articles:

On the right side of the exercise you are editing you can find a notes menu:
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Pressing this menu opens up a note with an editable field which you can use to add meta-data to your exercise. This is a completely free-form field, which you can use to explain how the exercise can be used, what it tries to teach, or add a list of things to do while editing. The note can be closed again by pressing the arrow on top:

This note will stay attached to the current exercise and is only visible in edit mode, therefore students cannot see it. Only teachers who can edit, will be able to see the note. If you want to create a new copy of the exercise without the note you can indicate this in the copy screen under the 'copy options' section: