How about... https://docs.moodle.org/dev/Tutorial
Although, there's loads of tutorials, resources and training online for building Moodle plugins.
Although, there's loads of tutorials, resources and training online for building Moodle plugins.
Doing it "right" will take a bit longer but the maintenance becomes so much easier. Plus, if it turns out to be something that other people might want you can submit it to the Moodle Plugins directory (CV driven development!)