Are you new to using CircuitPython? No worries, there is a full getting started guide for the Trinkey board here. Adafruit suggests using the Mu editor to edit your code and have an interactive REPL in CircuitPython. You can learn about Mu and installation in this tutorial.
The Trinkey comes with a Stemma QT connector, so the only wiring you'll need to do is plugging the recommended cable (or equivalent) into the reader and the board port. The connectors will only attach in the correct orientation, which is with the slightly exposed contact pads closest to the board.
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