The main thing is keeping everything clean. I check traffic sources, watch for unusual clicks, keep my site policy compliant and never ignore security alerts from Google.
Before choosing any ad network, I look at traffic quality, tracking data and how it performs after scaling. Some networks can look amazing at low spend but fail when you increase the budget. Small tests usually reveal the real picture.
I think the biggest mistake is scaling too fast. I test the source with different campaigns, track user quality and give it enough time before increasing budget. A stable source should perform consistently, not just during the first days.
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