Most of them are aimed at complete beginners yes, I think there's a more intermediate book but I think most are more about just explaining the commands and how to use them, rather than "this is the best method for such and such", though it does give examples for most stuff, it's more of a way to show the command in use.
I would just give AGk a try and use the help feature (F1 on any command automatically brings up the desired doc) and see how you get on.
You can always get the books later if you decide a certain topic needs more cover.
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