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Not a prep course, but for example Redis has a very good source code overview here https://github.com/antirez/redis#redis-internals

More remarkable is the fact that antirez updated the documentation in response to a post in Reddit. https://www.reddit.com/r/redis/comments/3re0aw/any_pointers_... Thank you antirez! :-)

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Also check out libpng's source.

https://github.com/glennrp/libpng

Oh wow. That's beautifully done. Simple comments that explain clearly what the code is doing, pretty clear choice of variable names so little head-scratching going on.

The documentation of redis is really good for a large open source project. I am not a contributor, but still read the source code from time to time. Full credit to antirez for taking the time to make it easy to contribute to redis!

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