17 - Three is a Magic Number
Three does really seem to be a magic number.
The number three can come in the form of three subjects (point of interest) in a photo, or a subject arranged in a triangle.
Assignment: compose a photo that contains three defined subjects, preferably arranged in a triangle.
https://www.diyphotography.net/the-number-3-and-photography/
https://erickimphotography.com/blog/2013/10/03/street-photography-composition-lesson-1-triangles/
https://www.institute-of-photography.com/three-magic-number-rule-threes-composition/
https://expertphotography.com/triangles-improve-your-composition/