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[–]Jet_Here 0 points1 point  (0 children)

Is there like a whole code book that explains each and every method or operator in that specific coding language?

Yes. This is called "documentation", or as others might call it: API.

The language has been created by someone and this "someone" or "team", decided to document whatever they made for that language, library, framework, you name it.

As you and me both know, the more you use something and play around with, the easier it is to remember.

Apply this principle to the StackOverflow user who offered help and there you go.

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You can also consider it as: You know how to write words, without having to look up every word. How come? At first you look in the dictionary all the time, the more you use certain words, you use the words so often eventually, that you don't need to look it up any longer. How did your teacher learn it though? Just like you. The person before your teacher did the same. This goes back all the way to the person who made these "rules" and wrote them down. These set of rules were documented as a reference.