I studied the libraries that I use by other developers, offering specific libraries, and I read all the documentation that I could find / need to use in the library.
I recently bought this book, Beyond the C ++ Standard , which presents the most common parts of Boost. Even with a reasonable increase in experience, I found this book very useful. He explains what libraries do, why they do it, how to use it, and some of the methods that they use to implement it.
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