Comment by cgrubb

I think this is a good youtube video for someone starting from zero:

https://www.youtube.com/watch?v=_DTpQ4Kk2wA

An issue is how to enter the symbols. The way I do it is I created some input methods for Mac and Windows which use at-signs followed by the APL community name for the symbol:

    @times       ×
    @grade       ⍋ 
    @reverse     ⌽
    @domino      ⌹

https://github.com/clarkgrubb/latex-input/tree/master/apl