Okay, so...by the time you're reading this, the rule book has probably ballooned from a short little journal to an entire encyclopedia with examples.
There are several very good reasons for that, but I am not liberty to share those reasons...aside from the sentence: Always keep a meat pie in your pocket.
Just...just trust me on that.
Anyways...Round 2!
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Rule#6: Always be armed.
I'm not entirely sure if this rule is exclusive to my neck of the woods, but I have found it prudent to have some form of weapon on hand in case shit goes sideways or you need to trade for stuff...or you need to threaten someone.
Either way, if you have a pocket dimension ability, go nuts, hide something big.
Otherwise...don't hide anything bladed in sensitive area, keep those limited to sleeves and in mechanisms.
Additionally, bombs in the teeth are a mixed bag.
A very mixed bag.
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Rule#7: Learn from your peers, don't steal from them.
Whether your ass got blasted into a whole new world or one from a novel or a saucy videogame, for the love of the gods, don't steal from your friends.
Just don't.
It leads to unnecessary drama, and possible misunderstandings that roll into betrayls and bullshit like that.
The only exception to this rule is if the person has a cursed item or something evil, but that's...uncommon.
Anyways, not stealing from your peers also opens up the possibility of making friends with them, so you can learn their secrets and skills without having accidentally insult their mothers and causing a blood debt to be owed.
...
Minor addendum to this: if your cultivation path involves a rare item that a friend of yours happen to have collected, don't steal or lie to them about needing it, they're probably open to a trade.
That or someone else will be gunning for their ass anyways and you can just retrieve it from whoever stole it.
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Rule#8: Honey Traps come in all shapes and sizes, so know your backgrounds.
A multiversal truth about reality is that way too many people believe that they're significantly more clever or observant than they actually are.
They always think that they wouldn't succumb to a vampire's sweet words, the charm of a succubus or a werewolf's musk when presented, but you'd be surprised how those same people fall weak in the knees to a pretty face and a few kind words.
This is especially true in places that actively recognize isekaied individuals and make it a whole ass market ot enslave and capture such people.
That being said, one should at least try and familiarize oneself with the types of honey pots they can encounter when traveling around their world.
In a magic and might kind of place?
Priests, prostitutes and magic treasure tend to be tricky.
Futuristic as hell?
Hookers, scammers and tech people.
Alternatively, becoming a honeypot yourself can be ludicrous, but good luck with that shit.
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Rule#9: Forbidden is forbidden for a fucking reason.
While it is true that the rulers of any given society will attempt to rule that mundane shit such as who to love, what to eat or what to read is "forbidden for the good of the public", sometimes, shit is forbidden for very good reasons.
The sealed failed experiments of a master alchemist?
Probably mutates into monsters or causes hyper cancer.
The cursed sword of a heaven-splitting sword master who got killed because of cuckoldry?
Probably gonna make you a mass-murdering cannibalistic incel who ends up slicing off their own dick.
A giant being sealed under seven-hundred seventy-seven golden chains, each fucking ringlet having an entire sutra carved into them all while being pressed down by a fucking mountain radiating enough energy to cause a fucking housefly to become enlighten.
Don't fucking free him.
A magical sacred grove full of magic trees that grow glowing magic fruit from trees that bleed when you cut them and for some reason has no fucking animals nearby that want to eat the aforementioned?
Don't eat the fruit.
All that said though, sometimes cursed shit is super valuable, just be prepared to have countermeasures or what other weird requirements necessary to reverse or break them curses.
Become the superior alchemist, have some holy water on hand, have a VERY good reason to free the devil and if you're gonna eat that fruit...get some Pepto-Bismol ready.
Either way, forbidden shit is forbidden for a reason, find a better reason to make it not so.
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Rule #10: Beware the chain
The butterfly effect is an asshole, and frankly can apply to more things than we'd care to admit.
Knocking over a glass of milk causes a mess, pooping in the river can give someone upstream a bad case of parasites and "accidentally" killing someone may lead to an international diplomatic incident.
Be wary, my fellow isekaied schmucks, because every decision we make can cause all sorts of issues and reactions that can come back to bite you in the ass in a variety of ways.
Maybe that noble you snubbed decides to send assassins, maybe that egg you bought is dragon egg, maybe that girl you saved the one time ends up falling in love with you and it turns out her family is loaded beyond belief because they're actually that world's equivalent of the fucking mafia.
In essence...just be mindful who you talk to and how you talk to them, because that jackass might be royalty, head of a powerful religion or actually god...twice.
...
Some of these rules might be more personal than I would like to admit.
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At this point that is an additional five rules to add to the list and I think this is a good point to stop for the time being.
These past few rules were rather survival focused and very much just common sense type things, everything pass this point will probably be a bit more positive.
But before I close out, one more thing.
This last one bit is less of a rule and more of a piece of advice: witch's brew are a fifty-fifty shot.
If you're gonna drink one, make sure to keep anti-venom or de-cursing salt nearby.
Speaking from experience...