Most founders' first experience with paid media is boosting a post and watching the money disappear with nothing to show for it. Performance marketing done properly is a different discipline entirely, closer to a measurement system than an ad.
Performance marketing is any paid media that's measured against a specific, trackable outcome, a sale, a lead, a sign-up, rather than judged on reach or impressions alone. If you can't tie the spend to a number that matters to the business, it isn't performance marketing yet, whatever the platform calls it.
The single most common founder mistake is running ads before conversion tracking is properly set up. Without it, the platform's own algorithm is optimising blind, and every report afterward is a guess dressed up as data.
A common instinct with a limited budget is to go broad and hope volume makes up for it. It's usually the opposite: a small budget spread across a broad, cold audience rarely gathers enough data to optimise at all. Tighter targeting gets a small budget to a decision faster.
Ignore vanity metrics for the first few weeks. Watch cost per result and where in the funnel people are dropping off. That tells you whether the problem is the audience, the creative, or the landing page, which is a far more useful diagnosis than a reach number.