I am spending money but not getting conversions. Where do I start diagnosing?
It provides a structured funnel diagnosis working backward from the conversion. Step one: check whether clicks are even landing (are your landing pages loading? are URLs correct?). Step two: if landing pages load, check the message match — does the ad promise match what the landing page delivers above the fold? Step three: if message match is good, check conversion tracking itself — is the tag firing correctly on the thank-you page? Step four: if tracking is sound, check search query reports for irrelevant queries bleeding budget. Most 'no conversions' problems are solved by step two or step four.