Using the second example video, The Arctic: U.S. Military Engagement Past and Present, as a model, create part of what might be the introduction of a longer narrative oriented video. If you have footage or photos you want to use, you are more than welcome. If you would like to play around with existing footage like I did, here are some resources.
Using the first example video, Boston College Libraries Digital Scholarship, create a more informative, less narrative video. As the second example video, it can be just the beginning of a longer video.
With either option, focus on setting a tone and establishing a style, and don't get bogged down trying to have all of the content worked out. See if you can employ a few of the techniques you have learned about, e.g., transitions, sound bridges, and cutting on movement. Note that both examples are around two minutes or less. Keeping yours short as well will allow you to focus more on gaining and honing skills.
You will need to use iMovie or Microsoft Video Maker. (Please note that Video Maker does not have all of the same functionalities as iMovie.) Microsoft Video Maker should already be installed on PCs. If iMovie is not installed on your Mac, you can download it for free from the app store.
Instruction videos will guide you through the use of iMovie and, when possible, its MS Video Editor equivalent. (They are organized as seen below.) While they cover the majority of these applications' functionality, they do not cover everything. For additional support, see the iMovie and Video Editor user guides.