Pardon the rudely late reply. I just noticed the responses in my notifications today. That is why I buy the physical paper books, no power supply needed; especially during the blackout with only a flashlight to use and enough battery power in the laptop.
Last time I looked at the linux handbook (10th ed.) it was pricey and it was limited to active industry professional sys admin’s only, there was a long-form attached that included current employment. That is one of the reasons that make it difficult to adopt linux in the first place. Unless they sell it on Amazon…