CRO Fundamentals

68% of small businesses don’t have a conversion rate optimization strategy. Not a bad one. None at all. Meanwhile, they spend $92 getting visitors to their site for every $1 they spend converting them.

CRO fixes that imbalance. And it starts with the basics.

The whole process is a loop: audit your site to find problems, form a guess about what to fix, test the fix, measure results, repeat. Every article in this section covers one piece of that loop. Here’s where to start based on where you are right now.

Brand new to CRO? Read What is CRO first. It explains what a conversion is, how the optimization loop works, and why it matters for revenue. Plain English, no jargon. It’s the foundation everything else builds on.

Know the concept, want to learn from others? Our CRO blogs roundup ranks the best conversion optimization blogs by experience level. It’s filtered for quality: still publishing in 2026, sharing real test results, not recycled AI filler.

Ready to find what’s broken? A CRO audit is the starting point for any real optimization work. It walks through a prioritized framework for finding where visitors drop off and which pages leak the most revenue. Think of it as a health check before you start testing.

Want to actually run tests? CRO testing covers the full testing toolkit beyond A/B tests, including when to use multivariate tests, bandit testing, and qualitative methods. It helps you pick the right test type for the right situation.

Wondering which numbers to watch? CRO metrics sorts the important numbers from the vanity ones. Leading vs lagging indicators, organized by business model, with benchmarks for each.

Trying to make CRO and SEO work together? They can conflict. CRO and SEO shows where the two disciplines clash, how to resolve those conflicts, and which to prioritize when you can’t do both at once.

Building your first full project? The CRO guide is the step-by-step walkthrough. Hypothesis to results, organized by team maturity level.

The biggest mistake beginners make? Trying to fix everything at once. Pick your highest-traffic page with the worst conversion rate. Change one thing. Test it with Kirro in about three minutes. That’s your first CRO project.

These fundamentals are part of the bigger conversion rate optimization picture. Once you’ve got the basics down, the other clusters (strategy and process, benchmarks, tools) build on top.

For more on how Kirro fits into your CRO workflow, the CRO tools guide breaks down the full stack.