Another way to approach this: review other people's code at work (e.g. code in another language or for another product). Even if you don't know the syntax of a

Another way to approach this: review other people's code at work (e.g. code in another language or for another product). Even if you don't know the syntax of a language, you can probably follow enough of it to learn something interesting. A commit is going to be a much more easily-digestible unit than a whole codebase, and you can go ask the author to explain anything that you don't understand. Plus, over time you might understand enough to help out on that project, or help integrate it with yours.