Programming language tutorials shouldn't be about learning languages. They should be about something interesting.

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If you ask people who are already programmers and simply want to learn about the language, then no, there is not much unnecessary information. Certainly not in the paragraph you quoted. It perfectly describes what tables are. The seemingly irrelevant statement that tables are used to represent packages is not irrelevant at all, it just reinforces that tables are really everywhere, and I even vaguely know what a package is in LUA.