Storyboard That is an online storyboard creator that helps visually communicate ideas and concepts to quickly tell a story. It provides templates in which you can create your stories in a comic strip style along with hundreds of scenes, characters, and text bubbles to fill your storyboard's frames.
Free accounts allow for up to 3 x 2 layout of boxes with/without Titles above and Descriptions below. There are options to download as PDF, etc but those options leave watermarks...To avoid that...use the Print Option and save them as PDF to your Google Drive.
1+ class or many depending on tasks