many of the so called guide books - esp. in Kindle Unlimited - are 10 page ripoffs /simple copy paste of amazon help pages
better to use google searches initially, then when you land on useful how-to web sites for Fire devices, bookmark those
2019 books may refer to features you don't have on a 2017 device.
with google searches you can be specific and include 2017 or 7th gen in the search
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