Let's say I want to develop a plugin for Volumio (music player for rpi)

I literally asked this question today as I was shuffling through the Volumio documentation for a custom solution.

Let’s say I want to develop something like a volumio plugin to do X. Now bear with me, let’s say I have little idea of what this would require and that all the programming experience is from school, but the project seems not so complicated.

How does one begin to write a plugin? Where does one look first? What language will it be written in? What do you need to research prior to writing it?

Thank you for your time all
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All the answers are here: https://volumio.github.io/docs/Plugin_System/Plugin_System_Overview.html