https://www.esri.com/en-us/what-is-gis/overview#image6
A geographic information system (GIS) is used to visualize information using maps, data, and analysis by layering research and images.
video on adding text in Imovie with photoshop
How to insert text:
Press the T and pick the font, color and size of the text
https://www.youtube.com/watch?v=n02KCr8RPdQ video for beginners