While it might not be necessary to “dive deep”, it is probably helpful to understand what exists, what is possible, and you can always come back to it once you need it. The example from the doc might give you a good idea as well.
As stated in the intro, this book is “not a top-to-bottom reference guide”, don’t look at it as a checklist of things you “have to” know, but as a guide to explore the language 
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