If you're a programmer, I wouldn't worry too much about examples of morphisms from math (unless you're interested in the math for its own sake). You already

If you're a programmer, I wouldn't worry too much about examples of morphisms from math (unless you're interested in the math for its own sake). You already know tons of morphisms -- every function in any programming language is a morphism (e.g. square x = x * x is a morphism Num -> Num). By the way, if you're interested in categories, you might like this post about using monoids for GPU parsing: https://raphlinus.github.io/gpu/2020/09/05/stack-monoid.html https://raphlinus.github.io/gpu/2020/09/05/stack-monoid.html (Monoids are the simplest examples of categories)