Not OP, but they mean the standard library, which is the set of functions, objects, and datatypes that come with langauge. That's not really the best way to lea

Not OP, but they mean the standard library, which is the set of functions, objects, and datatypes that come with langauge. That's not really the best way to learn a language, since you'll usually have the documentation at hand if you need it. It's more important to understand the conceptual model the language works with, so that when you want to do something you'll have an intuitive idea of where to look in the documentation and how to phrase your solution. Memorizing the standard library will simply come with usage, and isn't something you need to focus on.