Make a gif is an easy to use tool that allows you to create animated gifs quickly. These can be used for fun animations or for showing steps by step tutorials on how to do something. Take a look at an animated gif I created to show how to enable screen shot shortcuts on Mac OS:
How can this be used in a lesson? Have students create a slide show to describe the steps to do a task. They put all the images into make a gif, dowload the image, and turn it into the LMS, Google Classroom, or whatever the teacher has students using.