My 2 ISK:
Never fly something (or with something in the cargo) you can't afford to lose. Yes, not even in highsec. Meaning that you should not fly a ship you cannot afford to replace and refit.
I've always thought this was a stupid rule. If every non-bittervet followed this rule, the vast majority of us would never get to fly any of the really cool ships (and let's face it, that's kind of what we signed up for). I have lost ships that took me up to a month to replace, but by the gods, it was worth it.
You consent to PvP when you click "undock".
I violently disagree. If I undock to carry cargo from A to B, I intend to do that and only that and anyone who suicide ganks me is forcing PvP upon me.
You are not safe in 1.0 security space. CONCORD is there to punish, not to protect. Get used to the idea.
CONCORD and hisec mechanics are awful in general, but this has been discussed many times before and CCP have made it clear they can't be arsed improving upon that.
In most cases, the only way to be 100% safe from aggression inside the game is to be docked in a station. Being cloaked in a secret safespot could work too.
In other words, just don't play EVE. Got it.
Never grant corporation rights to stuff you can't afford to lose either. No exceptions.
People offering free stuff? Probably traps. Be cautious.
Free stuff usually isn't. Not even minerals you mine yourself.
If it sounds too good to be true, it probably is. Paranoia pays off here. Double-check everything.
Scamming and unethical behavior some would consider griefing is not only allowed, it is encouraged and rewarded by the game mechanics.
Harassment or real-life threats are not ok, and you can get a shiny ban for them. Learn the difference.
Experience matters, not ISK or Skills
You forgot: firesales have nothing to do with fire of any sort, when someone says they're quitting EVE they usually never do, never do direct trades with people you don't know, and check the market of individual items in an assorted goods contract because someone's probably trying to rip you off.
Tech-2 is usually cheaper and better, but harder to fit. Sometimes it's not better. Other times it's not cheaper. And occasionally, neither cheaper nor better.
Tech 3, on the other hand... Hecate best dessie.
There is no such thing as "a fair fight" or "an unfair fight". There's only a fight. Circumstances are irrelevant.
HORSEPUCKEY. Pitting a Talos against a Machariel in null? Fair. Machariel calling five friends over to gangbang the Talos? Unfair. It would be more accurate to say that this is a game that openly encourages psychopathic behaviour and therefore no-one with enough guns and ammo gives a ten-second frak about fighting fair.
Just because you can fly something doesn't mean you should.
Just because you can shoot someone doesn't mean you should. But, of course, people do that anyway because THIS IS EVE.
Also missing from the OP:
NEVER, EVER, EVER autopilot through nullsec.
NEVER, EVER, EVER carry PLEX or skill injectors in your cargo hold.
If CODE. tells you to buy a permit, flip them off, buy a new ship with a better fit and be more careful next time.
If you have a friendly or neutral citadel nearby and your ship is damaged or you have a suspect timer (but not a PvP timer), you can tether to the citadel and slowboat towards the structure to avoid being bumped outside the docking radius. You can even log off like that.