If you are using Google Classroom, Screencastify is an excellent option for creating short tutorials for students that can include anything displayed on your computer screen, as well as an optional inset of the teacher's image. Screencastify can also be used to make regular webcam recordings.
Your district controls whether you can install Screencastify. Usually students will only be able to install it with preauthorization on their district account. If they are logged into their Chromebook with their school account, look to the upper right for the Screencastify icon.
CLICK HERE to install. After installing, allow all the permissions and connect the tool to your Google Drive.