*By Timothy Jacqmin — Co-Founder, Nexuro Digital · July 2026*
TL;DR
- Google Analytics 4 (GA4) is Google's free tool that measures what visitors do on your website and app. Since July 2023, it has replaced the old version (Universal Analytics), which no longer collects any data.
- The big shift: GA4 no longer thinks in "pageviews" and "sessions" but in events (every interaction is an event). More flexible, but confusing at first.
- The actions that matter to your business (quote, purchase, call) are flagged as key events. That's what connects GA4 to your sales.
- For a business owner, 6 to 8 metrics are enough. The rest is noise. What counts: is GA4 bringing you customers, or just traffic?
- New in 2026: GA4 now identifies traffic coming from ChatGPT, Gemini and Claude through an "AI Assistant" channel. Visibility inside AI tools becomes measurable.
You open Google Analytics once a quarter. You see charts, numbers, a dense dashboard. You close the tab without knowing whether your marketing makes money. That's the reality for most business owners.
The problem isn't your intelligence. It's that GA4 was built for analysts, not for decision-makers. No one showed you the 8 numbers that actually matter, or how to link the tool to your sales.
Here's the guide we hand a business owner who finally wants to understand GA4: what changed, how to set it up properly, and what to watch so you steer with data instead of gut feeling.
What is Google Analytics 4 (GA4)?
Google Analytics 4 is Google's free audience-measurement platform: it records what visitors do on your website and mobile app, then turns those interactions into reports. How many people come, where they arrive from, what they do, and above all: how many take action (request a quote, buy, get in touch).
GA4 is the fourth generation of Google Analytics. It replaced Universal Analytics, the old version many SMBs had used for a decade. The switch wasn't optional: standard Universal Analytics properties stopped collecting data on July 1, 2023, and access to the old data was cut off during 2024. If your last "real" tracking predates that, you have a gap in your statistics.
For an SMB, GA4 remains the unavoidable starting point: it's free, connected to Google Ads and Search Console, and it becomes the foundation of any serious marketing steering, provided you set it up correctly (more on that below).
What actually changed between GA4 and the old version?
The deepest change is the data model: Universal Analytics counted "sessions" and "pageviews"; GA4 counts "events." Every interaction (a page viewed, a click, a form submitted, a video started) is recorded as an event tied to a user. No session in the middle: the action links directly to the person.
Why the shift? Because the web changed. People move from mobile to desktop, decline cookies, juggle between site and app. The old model, built on sessions and third-party cookies, could no longer follow those journeys. GA4 unifies web and app, bakes in consent handling (GDPR) and relies on several identity signals.
In practice, your vocabulary changes. Here are the useful equivalents:
| Old version (Universal Analytics) | Google Analytics 4 (GA4) | What it measures |
|---|---|---|
| Pageviews | Views | Number of pages / screens viewed |
| Sessions | Sessions (recalculated via the session_start event) | Visits grouped over time |
| Bounce rate | Engagement rate | % of genuinely engaged sessions (the positive flip side) |
| Goals | Key events | Actions important to the business |
| Everything is a "hit" | Everything is an event | Every interaction is a named event |
Key takeaway: don't try to make GA4 look "like before." It's a different logic. Bounce rate is gone in favor of the engagement rate, which is more honest: it measures visitors who stay, click or convert, not those who leave.
Events, key events, conversions: what's the difference?
This is the #1 beginner confusion, and it directly affects your decisions. Let's clarify in the right order: an event can become a key event, which can become a conversion.
- An event is any measured interaction: a page view, a scroll, a click, a download. GA4 collects many of them automatically.
- A key event is an event you decide to flag as important to your business: a contact form submitted, a purchase, a triggered call. You define what counts.
- A conversion, in Google's current wording, mainly refers to measurement on the Google Ads side, to optimize your paid campaigns.
Careful, because Google changed the wording in 2024: what GA4 used to call "conversions" is now called "key events," with the term "conversion" reserved for Google Ads. According to Google's official documentation, a key event "measures an action that's particularly important to the success of your business," while a conversion is used "to measure the performance of your ad campaigns." You didn't have to reconfigure anything: your old conversions automatically became key events.
Common mistake: flagging everything as a key event. Don't. Two or three actions maximum, the ones that genuinely make money (a quote, a purchase, a qualified contact). If everything is important, nothing is.
How do you set up GA4 properly (without getting it wrong)?
A clean GA4 setup rests on four foundations: collection, key events, connections and GDPR compliance. Skip one step, and your numbers become unusable. Here's the order we follow with our clients.
- Create the property and data stream. In GA4, a "property" represents your business; a "data stream" represents your site (or app). You get a measurement ID to install on all your pages.
- Install tracking through Google Tag Manager. Rather than pasting code into your site, go through Google Tag Manager: it's the central hub that manages all your tags cleanly, without touching the code every time. (We cover it all in our Google Tag Manager guide.)
- Define your key events. Identify the 2-3 actions that matter (form submitted, purchase, call) and flag them as key events. Without this step, GA4 measures traffic, not results.
- Connect Google Ads and Search Console. These links tie your ad spend and your organic search to what visitors actually do. That's where measurement becomes steerable.
- Handle consent (GDPR). In Belgium and Europe, you must collect consent before dropping certain cookies. A well-configured banner (Google Consent Mode) governs both the legality and the reliability of your data.
Recommendation: don't leave GA4 on its default setup. By default, it counts views and sessions. Without key events defined, you'll never know whether your site turns those visits into customers. Setup is 80% of the value.
Which GA4 reports are truly useful for a business owner?
You don't need GA4's 200 screens. Four report families are enough for an owner to steer: Acquisition, Engagement, Monetization and key-event tracking.
- Acquisition: where do your visitors come from? Google Search, social media, email, ads, direct. This report answers "which channel brings me people?"
- Engagement: what do they do once they arrive? Which pages, how long, which key events triggered. This report answers "does my site hold attention?"
- Monetization (e-commerce): revenue, products viewed, average order value, purchase rate. This report answers "what makes money?"
- Traffic acquisition + key events: the king of cross-references. It tells you which channel doesn't just drive volume but generates real business actions.
In 2026, GA4 also added useful reports: an automatic summary on the home page (the top three changes since your last visit, AI-generated) and a conversion attribution analysis report to see which channels contribute, even when they aren't the last click. These additions make the tool more readable for a busy owner.
New in 2026: does GA4 measure traffic from AI tools?
Yes, and it's a major change for anyone following the GEO topic. Since May 2026, GA4 identifies traffic coming from AI assistants (ChatGPT, Gemini, Claude) through a dedicated "AI Assistant" channel. In practice, when someone clicks through to your site from a ChatGPT answer, GA4 now files it under this channel, with an ai-assistant medium.
Why does this change everything? Because until now, that traffic was invisible or buried in "direct." Your customers increasingly ask an AI rather than Google. Being able to measure how many visitors (and conversions) come from AI is the first step to investing in GEO with your eyes open.
This is exactly our pioneering ground in Belgium. If the topic interests you, we detailed it here: how to be visible and cited in ChatGPT, Claude and Perplexity.
How do you connect GA4 to your ROI (and not vanity metrics)?
This is where the whole point of the tool plays out. GA4 creates no value on its own: it becomes profitable the day you tie its data to your revenue. A traffic spike is worthless if it doesn't turn into customers. As we keep saying: the goal isn't more traffic, it's the right traffic.
Three reflexes to move from statistics to ROI:
- Assign a value to your key events. Is a quote worth 50, 500, 5,000 on average? Attach a value to each key action. GA4 will sum the value generated by each channel.
- Watch cost per action, not traffic. Cross GA4 with Google Ads: how much does a lead cost you by source? That's steering with data.
- Make measurement reliable with server-side tracking. Ad blockers and cookie refusals lose data. Server-side tracking recovers part of what escapes the browser. We explain the logic in our server-side tracking guide and, more broadly, in our piece on conversion tracking and ROI.
Key takeaway: poorly wired, GA4 produces pretty charts no one uses. Properly wired, it answers the only question that matters in a board meeting: "where do we put the next marketing euro?"
The GA4 metrics to track (for a business owner)
Here are the metrics worth your attention, and those to ignore. Goal: a dashboard that fits on one screen.
| GA4 metric | What it tells you | Owner priority |
|---|---|---|
| Active users | How many distinct people visit your site | High |
| Sessions by channel | Which levers drive traffic (SEO, Ads, social, direct) | High |
| Engagement rate | % of genuinely engaged visits (replaces bounce) | Medium |
| Key events | Number of business actions triggered (quotes, purchases) | Critical |
| Conversion rate (sessions with a key event) | % of visits that take action | Critical |
| Key-event value | Revenue / value generated by channel | Critical |
| Views | Pages viewed (raw volume) | Low |
| Average engagement time | Real time spent interacting | Medium |
Simple rule: read the three "Critical" rows every week. The rest, once a month is enough. Any metric that doesn't help you decide where to invest is a vanity metric.
FAQ
What is Google Analytics 4?
Google Analytics 4 (GA4) is Google's free platform that measures the audience of your website and app. It records every interaction as an event, then turns them into reports: where your visitors come from, what they do, and how many take action. Since July 2023, GA4 has replaced the old version, Universal Analytics.
Is GA4 free?
Yes. Google Analytics 4 is free in its standard version, which is more than enough for an SMB. There is a paid version (Analytics 360) aimed at very large accounts with huge data volumes and advanced needs, but 99% of SMBs don't need it. GA4's real cost isn't the license: it's a clean setup.
What's the difference between a key event and a conversion in GA4?
A key event measures an action important to your business (quote, purchase, call), from an analytics standpoint. A conversion is mainly used to measure and optimize your campaigns in Google Ads. Since 2024, Google renamed GA4's old "conversions" to "key events," and reserves the word "conversion" for Google Ads.
How do I install GA4 on my site?
Create a GA4 property, get its measurement ID, then install tracking ideally through Google Tag Manager rather than pasting code into every page. Next, define your key events (the actions that matter) and connect Google Ads and Search Console. Finally, configure GDPR consent. Without these steps, GA4 measures traffic, not results.
Do you still need GA4 in the age of AI?
Yes, more than ever. Since 2026, GA4 even identifies traffic coming from AI assistants (ChatGPT, Gemini, Claude) through an "AI Assistant" channel. As your customers increasingly ask an AI their questions, GA4 becomes the tool that tells you how many visitors and sales come from it. Without measurement, you can't invest wisely in GEO.
How long does GA4 keep my data?
By default, GA4 keeps detailed exploration data for a limited period (adjustable, typically 2 months or 14 months depending on your setting). Aggregated standard reports stay available longer. Set the retention period during setup, and if you want a long history, export your data regularly, for example to a Looker Studio dashboard.
Conclusion
Google Analytics 4 is neither magic nor reserved for experts. It's a free, powerful tool, but delivered bare: without setup, it stacks numbers no one steers. Properly wired, it answers the only question that matters: is your marketing generating customers, or just traffic?
The right approach isn't to watch everything. It's to define 2-3 key events, track 6-8 metrics, and tie every euro spent to a measurable result. Not more data: the right data.
*You have GA4 installed but you're not sure it measures the right things? We can look at it together, simply, during a free audit of your digital ecosystem. We check your setup, your key events and your conversions. No bots, no salespeople: Timothy or Bryan gets back to you personally within 24 hours.*
*— Timothy Jacqmin, Co-Founder, Nexuro Digital*
Sources
- [GA4] Conversions vs. key events in Google Analytics — Google Analytics Help: https://support.google.com/analytics/answer/13965727
- [GA4] What's new in Google Analytics — Google Analytics Help: https://support.google.com/analytics/answer/9164320
- Google Analytics Changelog (developer documentation): https://developers.google.com/analytics/devguides/collection/protocol/ga4/changelog
- Google Analytics Help (official help center): https://support.google.com/analytics
