[_greim_]

Ideally, you'd be able to:

* Read any developer contribution docs.

* Glean what info you can from the layout and naming of the source tree.

* Peruse the code and any comments and see what does what.

* Read the unit tests to see how things are expected to work.

* Peruse the issues list to see what's breaking.

* Try to get a feel for how the contributor(s) think by reading any public blog posts, etc.

If none of those approaches yield any insight, don't blame yourself; maybe instead look for a different OSS project to contribute to.