And don't forget of course w3schools! I really don't know why so many people despise w3schools as to me they offer a great overview of a topic. Perhaps that's just it though, they don't go in to enough depth. It's definitely a unique style though. They're not superfluous at all and I really do like that approach.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.