Google Analytics 4 (GA4) is a free tool from Google that tracks who visits your website, where they came from, and what they do once they arrive. It replaced the older Universal Analytics platform in July 2023, and every website collecting analytics data today should be running GA4. If you set up analytics more than two years ago and have not touched it since, there is a reasonable chance your data stopped recording the day Google switched off Universal Analytics. This guide explains what GA4 actually does, which parts matter most for a small business, and how to start making sense of the numbers.

What GA4 actually tracks

GA4 is built around events rather than pageviews. Every interaction on your site is recorded as an event: a page load, a button click, a form submission, a video play, a scroll to the bottom of the page. Some events are collected automatically without any setup on your part. Others need to be configured. The events that matter most for a typical small business are page views (which pages are visited and how often), sessions (a single continuous visit from one person), engaged sessions (visits where the person actually did something, not just landed and left), and conversions (any event you mark as meaningful, such as a contact form submission or a phone number click).

The two reports to check every week

GA4 has dozens of pre-built reports, most of which you can ignore. Two cover the questions that matter most.

  • Traffic Acquisition: Shows which channels are sending visitors to your site. The default view groups traffic into Organic Search (Google), Direct (bookmarks, typed URLs, and some mobile app traffic), Referral (links from other sites), and as of May 2026, AI Assistant (traffic from ChatGPT, Gemini, Claude, and similar tools). This report tells you whether your marketing is working and where to invest more effort.
  • Landing Pages: Shows which pages visitors arrive on first. If your homepage gets 80% of traffic and all other pages get almost nothing, that is a structure problem worth solving. If a specific blog post or service page is drawing organic visitors, that is a signal to build on.

What GA4 does not show you

GA4 tells you what people do on your site after they arrive. It does not tell you which search queries brought them from Google, which pages are indexed, or why certain pages dropped in rankings. For those questions you need Google Search Console, a separate free tool that connects directly to Google Search. The two tools are designed to be used together, and you can link them inside GA4 to see keyword and ranking data alongside your on-site behavior data.

GA4 shows what happens on your site. Google Search Console shows how Google finds your site. You need both.

Key metric definitions worth knowing

A few terms in GA4 have non-obvious meanings that trip up first-time users.

Key GA4 metric definitions
TermWhat it means
UsersUnique visitors in the selected date range, identified by a cookie or device ID
SessionsA single continuous visit. One user can have multiple sessions.
Engaged sessionA session lasting more than 10 seconds, with a conversion, or with at least 2 page views
Engagement ratePercentage of sessions that were engaged sessions. Higher is better.
Bounce ratePercentage of sessions that were NOT engaged. Lower is better. This is the inverse of how Universal Analytics defined bounce rate.
ConversionsAny event you mark as a conversion in GA4 settings: form submission, phone click, checkout, etc.

How to set up GA4

Setting up GA4 takes about 15 minutes if you have access to your website's plugin manager or code.

  • Go to analytics.google.com and sign in with your Google account
  • Click 'Start measuring' and create a new account and property for your website
  • Under Data collection, choose Web and enter your site URL
  • Google will give you a Measurement ID starting with G-. Copy it.
  • Add the Google tag to your site: on WordPress, use the Site Kit plugin or Google Tag Manager; on Shopify, paste the Measurement ID in Online Store settings; on Wix, use the Marketing Integrations panel
  • Wait 24 to 48 hours, then check the Realtime report. If you see activity when you visit your own site, the setup is working.

Frequently asked questions

Common questions about Google Analytics 4 from small business owners getting started.

Is Google Analytics 4 free?

Yes. GA4 is free for any website collecting fewer than 10 million events per month. A typical small business website sends far fewer events than that. There is a paid version called Google Analytics 360 aimed at enterprise companies with large data volumes and advanced reporting requirements. Standard GA4 has no meaningful limits for a small business.

What replaced Universal Analytics?

Google Analytics 4 replaced Universal Analytics on July 1, 2023. Universal Analytics stopped collecting new data on that date. Google retained historical Universal Analytics data until July 2024, at which point it was deleted. If you have data from before 2023 that you need to preserve, it should have been exported before the deletion deadline.

How is GA4 different from Universal Analytics?

The main differences: GA4 is built around events rather than sessions and pageviews. Bounce rate is redefined as the inverse of engagement rate, so high bounce rates in Universal Analytics look different in GA4. Cross-device tracking is more accurate because GA4 can merge data from the same user across devices when they are signed into Google. Conversion tracking is more flexible because any event can be marked as a conversion without creating separate goals.

How long does it take for GA4 data to appear?

Real-time reports update within seconds. Standard reports such as Traffic Acquisition and Landing Pages have a data delay of 24 to 48 hours. If you just installed GA4, check the Realtime report to confirm tracking is working, but wait a full day before relying on standard reports for decisions.

Can I use GA4 without a developer?

For most platforms, yes. WordPress, Shopify, Wix, Squarespace, and Webflow all have native integrations or plugin options that install GA4 by pasting your Measurement ID. No code editing is required. If your site is custom-built, your developer will need to add the Google tag to the page template, which is a simple task that takes less than an hour.

What is the AI Assistant channel in GA4?

As of May 13, 2026, GA4 has a dedicated channel group called AI Assistant that separates traffic arriving from ChatGPT, Gemini, Claude, and similar AI tools. Before that date, this traffic was lumped into the Referral channel with no easy way to separate it. The channel appears automatically in your Traffic Acquisition report with no configuration required.