Practical guide library

Advertising

Write clearer ads and test them fairly.

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What Makes a Good Advertising Headline?

A good headline helps the intended reader recognise “this is for me” and understand why the rest is worth reading. It should be specific enough to filter the wrong audience as well as attract the right one.

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How to Write a Better Call to Action

Tell people what action to take and what they receive or experience next. “Learn how to track your clicks” is often more informative than “Submit”.

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How to Test Two Ads Properly

Change one important element at a time, expose both versions to comparable traffic and decide the success measure before looking at results. Otherwise you may not know what caused the difference.

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What Is Click-Through Rate?

Click-through rate (CTR) is the percentage of measured impressions that produced a click: clicks divided by impressions, multiplied by 100. It indicates response to an ad, not whether the resulting visit was valuable.

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How Many Clicks Do You Need Before Judging an Ad?

There is no honest universal number. You need enough observations for the outcome you care about, and rare conversions require far more traffic than clicks. Use small tests to detect obvious problems, but avoid declaring a final winner too early.

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Common Online Advertising Mistakes

The most expensive mistakes are usually mismatch and missing measurement: targeting broadly, promising one thing and landing on another, changing several variables together, and judging success by clicks alone.

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Why Your Ad Gets Seen but Nobody Clicks

The offer may be irrelevant to that audience, the headline may be too vague, the creative may disappear in the placement, or the ad may not make the next step worthwhile. Diagnose before rewriting everything.