Get a taste for the basics of plugin compiling from Raf and The Cult Of Rig then check out our courses both the Maya C++ API 101 mentor led course and our more advanced 201 on demand plugin coding course.
You can also check out our free API compiling guide book to pair with the Cult of Rig video. https://www.riggingdojo.com/2019/12/24/free-maya-api-training-ebook/