https://www.youtube.com/playlist?list=PLfYUBJiXbdtSgU6S_3l6p...
There's also a concise guide covering every glyph, which if read in order only ever uses glyphs in examples that have been covered previously:
https://fastai.github.io/apl-study/
Finally, we have a discussion forum for learners:
https://forums.fast.ai/t/apl-array-programming/97188