Dangerous? it doesn't matter what KIND of book store. ALL book stores are spesh-traps.
Book stores are the autistic version of those UV-emitting electrically charged units mounted on walls to turn unwelcome, pestiferous winged arthropods into crispy critters. Only without the being electrically burnt alive and reduced to a smoking splodge of flash-broiled insect guts.
They lure you with their siren-song, they happily let you in alright, but once they have you in their scheming, malicious, machiavellian clutches, they don't let go again unless beaten senseless with a well-loaded cash card and a big sack full of heavy books.
Here's something you might like, or rather, will fucking LOVE.
Ever heard of library genesis? it's sort of like what sci-hub is for grabbing journal reference articles bypassing the paywalls used by the evil Big Publishing lot, a plague upon their houses be. For foul, moneygrubbing sleazy bastards like Elsevier (one of the really big journal publishing houses) employ such practices as to have drawn the absolute rage of not just end consumers who wish to read their hosted articles, but of universities, of the very scientists who have done the hard work, and then paid for their peer-reviewed articles to be published by these whore-born rat bastard slime.
They are so big and wealthy and powerful (the wealth coming from their ripping off everybody but themselves) that unis and other institutions more or less have no choice but to comply and subscribe to access to their journals, which costs them MASSIVE sums of money, more than the unis can afford, many can't afford to pay for them, but they've no choice, since to get recognition and scientists have their published papers, if it isn't in a prestigious, well known journal, probably hosted by these evil monstrous twats, and is instead, in some minor backwater journal from some tiny and better behaved, less unethical publishing house, it'll far less likely ever be read.
The unis pay for the subscription to the journal, the scientists themselves must pay a large amount per article, and even then, they are themselves, charged monkey money to merely view their end published article as it appears within the journal, quite possibly out of their own pocket.
As for end-users like myself, if I paid for journal access, not a subscription to an entire journal, I couldn't afford that if I WAS willing to put money in their pockets, it often costs upwards of $40-60 for a mere 24 hour access permission, more still, if one wishes to print a copy, for one, single, lonesome article.
And to put that into perspective, say I'm beginning a new project, not running a reaction I've run before, and have my own personal lab notes to go off, and experience to rely on, but entirely new, working out a synthesis from scratch, by picking a target molecule to start the very first step with, making or buying this, or extracting it from something I can either grow, or harvest in the wild, I'd then have to design each step in the reaction, likely as not look up exactly how to make certain reagents I both haven't got right then and there on my lab shelves/cupboards/fridge (I've a separate fridge for keeping chemicals, they don't go in the fridge that is for keeping foodstuffs cold), how to make the reagent or solvent, how to make the things I need to make it with, possibly how to make those, then to design each single step in what could be anything from 'add one to the other, heat for a while, filter and dry' to 15 steps or more, each requiring my making or buying the various reagents needed if there be any I haven't got, and that I need journal access to do so.
Meaning that could be between one or two articles, that'd each cost me $40-60 for just 24 hours permission to merely look at it, without being able to print it or save a copy, per article, per step in my synthesis from starting material(s) to final, cleaned, distilled, purified product, tested for purity and recrystallized, vacuum distilled, steam distilled, acid/base extraction or all of the above until it is clean to my standards.
If that's a 10 or even 20-step synthesis, requiring not hours, not days, not weeks but months of work, day in, day out, until my goal is reached and I have what I wished to make in a bottle, ready to be used for whatever it is created to be used for, that could mean 10+ papers PER STEP.
Just imagine how much that'd cost. I simply couldn't afford it if I WAS willing to put money into the coffers of those evil greedy shitbags............I don't HAVE that kind of income, and if I did, it'd all end up spent on reading journals, and then I'd have nothing left to buy and-or make the reagents, buy the solvents, any glassware needed I haven't got already, never mind money for food and drink.
Formerly I had to rely as did many people with no journal access through uni or other research institutions, on the good-will of those people within the private individual chemist communities, both clandestine chemist fora, and non-clandestine chemistry fora, to request the article, wait however long and just hope someone among us has access and can download a copy, upload to the forum for all to benefit from, and of course the various techniques developed by us private lab owners who practice chemistry and biology/biotech because we enjoy it.
Now there is sci-hub.tw and other sci hub addresses that, despite elsevier and their foul allies launching court action after court action, forcing domain names to be taken down, the creator, she's based in kazakhstan, and basically the courts can shut individual domain names down, but they can do nothing to her, personally, they cannot stop her just registering several more addresses for sci-hub the moment one gets shut down. Basically she can't be touched, and she knows it, and pretty much gives the big greedy corporate paywalling, closed-access moneygrubbing publisher bastards two fingers and a bag of flaming dog muck on their metaphorical doorstep, pissing through their letterbox and demanding they go measure how far it went across the carpet
A game of whackamole is being played, although now far, far more slowed down, addresses are taken down, rarely, I think by now the big greedy shits know that they might kill one address, but they know too that they cannot touch sci-hub's creator, that they'll take an address down, only for it to be replaced within a day or two, maybe even in hours. It's a game they cannot win. And even those WITH subscriptions through unis are using sci-hub out of principle to help force more open access (free access to full texts)
There is also library genesis. This is a library for books, of all kinds, not only scientific, but MILLIONS of books, scanned and uploaded by the people who own them, for free, so people can have open access to books too.
Some people might have to use TORbrowser, to bounce the connection through other countries to access the site, because there are court orders forcing ISPs to block access to libgen utterly. TOR bypasses this as easily as a flamethrower can bypass a wall of tissue paper.
http://gen.lib.rus.ec/ This is the address. If ISPs in your country block it due to court orders, then just use TORbrowser, connect via another country. Bingo, job done.
Literally millions of books, all free to DL.