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Practice is exactly the right idea! You might find Q by Puzzles helpful some simple puzzles with q solutions that illustrate distinctive features of the language.
The Reading Room also has puzzles for practice. You might start with John Earnests collection Cats Cradle and then see how the well-known Fizzbuzz game can be written in q.
Beyond that the Phrasebook is a collection of expressions to do this and that. Well worth studying and maybe you can provide some improvements!
The problems in this years Advent of Code competition are particularly ripe for vector solutions. I have discussed q solutions to the first weeks problems in the Advent of Code group here. In the new year Ill host a regular online vector d?j? for improving q skills.
Stephen