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See also https://beyondloom.com/blog/rankingoffruits.html for a nice introduction to the query syntax and its relation to K. (And RodgerTheGreat is John Earnest, the author).

In addition to the resources others have linked, the main "entrypoint" page for Lil is here: http://beyondloom.com/tools/trylil.html

The readme has links to various resources including tutorials: https://codeberg.org/ngn/k

Oh, sorry. I misunderstood the question.