The metrics that actually matter
ROAS, return on ad spend, is revenue divided by ad spend. A 3x ROAS means every rupee spent returned three in revenue. CAC, customer acquisition cost, is what you pay to win one customer. Together they tell you whether growth is profitable or just expensive.
Ignore vanity metrics. Impressions, reach and even clicks mean nothing if the economics do not close. A campaign with a high click-through rate and a terrible ROAS is a failure wearing a nice outfit.