There's a certain kind of wisdom that only arrives once you've watched your own cash evaporate. I'm curious about those lessons that seem painfully obvious in hindsight but only reveal themselves after real spend is on the line.
For me, it was the temptation to tweak everything at once. You start thinking you're optimising, but really you've just thrown a dozen variables into a blender and now you can't tell which one broke the machine. The seasoned operators I know treat their campaigns like a delicate ecosystem - sometimes the best adjustment is no adjustment at all.
Then there's broad match. Someone in another thread described it as "burning money with extra steps" and that stuck with me. It's true. The algorithm might be smarter than it was five years ago, but broad still invites a parade of irrelevant traffic if you haven't locked down your negatives.
And clicks - oh, the false god of clicks. I remember watching the traffic spike and feeling a little buzz, only to dig into session duration and see people bouncing in under five seconds. The search intent was all over the map. That's when I finally understood that negative keywords aren't some boring housekeeping task; they're probably the single most cost-effective thing you can do.
So what's your version of that? What did you only learn after the budget had already taught you the hard way?
