[QuercusMax]

Either read the source code if you have it, or read the docs and do your best. That's how it worked when I was learning to code as a middle schooler in the early 90s.

In grad school I worked on TinyOS, and my advisor told me to print out the source code and spend a week reading it until I knew how to make the changes I wanted.

When I worked at Google there was no external documentation to use, so if you couldn't find the docs, you better figure out how to read the source. They have very good code search there.