There are many good features in Whiteboard, that help make a great classroom experience for both professors and students.  

The interface of the desktop app looks like this, and is simple to navigate.

The bar at the bottom of the screen holds all of the pen options, as well as a highlighter, eraser, ruler, and lasso select.

In the right hand corner are more options that you can utilize.

The blue button is to invite others to the session.

The second button is where you can switch out what account you're using.

The third button is how you access Whiteboard's settings.

Here, you'll be able to find many functions that could help you.

If you right select in the center of the screen, you'll find even more functions you can utilize it.

From here, you can Paste, Add Image, Add Notes, Add Text, and Add PDF files.

The three dots provides even more options.

Using all of this, your whiteboard sessions will have everything you need for classes.