If you are looking for a course to do straight away, there is the ’Moodle Plugin Development Basics’ at https://learn.moodle.org/ (free) and the course I developed called "Moodle Plugin Development By Example" at https://mukudu.net/publishing/moopluginsbyexample/ with massive discounts for developers working in the ‘developing’ world. Alternatively, there is the MoodleBites for Developers Level 1 (paid) – (https://www.moodlebites.com/mod/page/view.php?id=24546) and a few short specific ones on Udemy (https://www.udemy.com/courses/search/?src=ukw&q=moodle+development).
General developer forum
New course: Moodle development environment
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