When it comes to "showing what you know", one of the most powerful tools available for both teachers and students are screencasts. All of Apple computers come equipped with QuickTime Player with a built-in screencasting tool. However, a great resource that works on any computer using Chrome (Macs, Windows, or Chromebooks) is Snagit for Chrome.
Snagit for Google Chrome is a free screen capture and recording app that works on Chromebooks or in the Chrome browser. Using Snagit for Google Chrome can help you provide better feedback, encourage teamwork, and create images, videos, and animated GIFs that explain exactly what you mean.
Now you might be thinking, animated GIF? What the heck is that?!? An animated GIF is basically a very short, looping video (20 seconds or less) that you can pop into a Google Doc, blog post, or other digital resource that will walk students or staff through a series of steps. Below is an example of one demonstrating how to change your font in a Google Doc. They are perfect for showing users how to complete a simple, technical task. I know of educators who use these to remind students the steps for using a tool or submitting an assignment.
Snagit for Chrome will allow you and your students to not only create animated GIFs, but also annotated screenshots and videos. If you would like to get started with Snagit for Chrome check out this instructional video.