I'll do you one even better: "Never land in a situation where you just got fired and have to find a job quickly. Easy, right?".
That's what 99.9% of all negotiation advice I ever saw boils down to. Basically beat the game before it beats you.
Really cute... until you remember most people don't live to "play the negotiation game". They want a stable paycheck and to raise their family.
But who's asking, right.