Sales
- CTR Click-through rate — the share of people who click your ad. Aim to clear your own recent baseline before scaling.
- CPC Cost per click — how much each ad click costs you. Watch whether click cost still leaves room for a profitable cost per sale.
- CPA Cost per acquisition — what you pay per sale or signup. Judge against your break-even point, not a generic number from the internet.
- ROAS Return on ad spend — dollars earned for every dollar spent on ads. Use as a decision metric only if your tracking is set up properly.