[ibll]

Shortcuts is Apple's block based programming language for automating stuff between apps. Pretty barebones but still useful. Just so you get an idea of how limited it is, the only way to emulate a normal function is to recursively call the entire program with different input parameters and skip down to the right region of code.

Complications are just the little informational widgets on Apple Watch faces. Just like on normal watches.

Iterations had no special meaning here.

The Modular face is basically one of the lockscreen options on an Apple Watch. It dictates the layout of complications. Don't know why it was mentioned so specifically.