Googling for APL examples is now complicated by Amazon squatting on the same acronym for "Alexa Presentation Language". That's frustrating, as I'm interested in understanding APL a bit better, but I learn from looking at and tinkering with code that does things I already kinda understand how to do in other languages/paradigms.
But, I did find APL Wiki which has a lot of good examples of code that does small comprehensible things. https://aplwiki.com/FrontPage