Google Analytics 4 for small business: what to set up, what to watch and what to ignore

What GA4 is and how it differs from the old Analytics

Google Analytics 4 (GA4) is the current version of Google’s free tool for measuring traffic on websites and apps. It replaced Universal Analytics, which stopped processing data in July 2023. If you still have habits from the old version, some of them no longer apply.

The key difference: GA4 is built around events. Almost any action (a page view, a click on an outbound link, a scroll, a form submission, a purchase) is an event, with parameters that describe it. A session is a period of activity by a user. An active user is someone who has interacted with your site. The engagement rate is the percentage of sessions with engagement: by default, sessions that lasted longer than 10 seconds, included a key event or had at least two page views. Bounce rate still exists, but it is simply the inverse of engagement rate.

Key events are the events you mark as important to the business. In earlier versions of the interface they were called “conversions”, and that term is still used in Google Ads. For a more technical look at conversion measurement, see our guide to conversion tracking with GA4 and the Meta Pixel.

The eight settings to make on day one

You do not need dozens of settings. These eight, made once, prevent most data problems. Menus change, so follow the names you see in the current interface.

1. Create the property and data stream for your website and install the measurement code (directly, through Tag Manager or through a trusted plugin).
2. Set data retention to the longest option available (for event-level data this is 14 months, not the default two months).
3. Check enhanced measurement: page views, scrolls, outbound clicks, site search, downloads.
4. Exclude internal traffic: define your office IP addresses and activate the filter, so your own visits do not distort the picture.
5. Exclude unwanted referrals, such as payment processors, so a successful payment does not look as though it came from “another site”.
6. Link Google Ads and Search Console if you use those services.
7. Mark your key events (see the next section).
8. Add a second administrator, using a company address, so you do not depend on one person.

Then verify that it works in the real-time reports and in debug mode (DebugView). If you run tests, keep them in DebugView or in a separate property so that test data does not mix with real data.

Key events: what to mark and what to leave alone

The rule: mark only actions that bring a customer closer to paying. If you mark everything, you can see nothing. For most small businesses, three to five key events are enough.

For forms, the safest trigger is the thank-you page or the actual submission, not a simple click on the button. For calls and emails, a click is only an approximate indicator: it does not prove the person actually phoned. If you run an online shop, e-commerce events (add to basket, purchase with value) need a correct implementation, and that is where specialist help is worth having.

The five reports that matter each month

GA4 has many reports, but a business owner usually needs five. You can save them as favourites and check them once a month.

• Traffic acquisition: where sessions come from (organic search, paid ads, direct, social, email, referrals). Compare with the previous month.
• Pages and screens: which pages are visited most and which have weak engagement rates.
• Events: how many key events you had and where they came from; this is where you see whether forms and orders are growing.
• Purchases or revenue (for shops): order value and best-selling products.
• Tech and location: the share of phones against computers, and your main cities; useful for design and advertising decisions.

For more specific questions there is the Explore section, where you build your own tables. Do not rush into it: a simple report read consistently helps more than a complicated dashboard that you never open. A model of indicators for a monthly report is in our guide to the KPIs of a monthly marketing report.

Tagging campaigns: without UTM, your traffic is blurred

GA4 recognises some sources on its own, but a newsletter, a link in a post or an ad does not show clearly where it came from unless it is tagged. The result: a lot of traffic ends up under “direct” or an unclear “referral”.

The fix is simple: add UTM parameters (source, medium, campaign) to the links you control. Be consistent in how you write them (lower case, no spaces, the same names each time), otherwise one source gets split across three rows. The UTM link builder in our Lab helps you build them uniformly, and our guide to UTM parameters explains the naming rules. Do not put UTM tags on the internal links of your own site: they can overwrite the original source and distort attribution.

Audiences: simple and useful

An audience is a group of users defined by behaviour, for example people who visited the pricing page or added products to the basket without buying. You can use audiences in analysis, to compare groups, and in Google Ads, for remarketing, if the link between the accounts is active and consent allows it.

Start with two or three: visitors who saw the contact page without submitting the form, past buyers and basket abandoners. Keep in mind that very small lists cannot be used in ads, and for remarketing you must comply with consent requirements and your privacy policy.

What you can ignore, at least at first

The interface can look intimidating because everything in it is presented as equally important. It is not. You can safely postpone:

• Predictive models and advanced analyses.
• The demographics report (age, gender), which appears only when there is enough data and may be incomplete.
• New versus returning users as a “target” in itself.
• Average engagement time on its own.
• Day-to-day comparisons: variation from one day to the next is often just noise.
• Complex explorations, until you have a concrete question that the standard reports cannot answer.

Note that the figures in GA4 are not identical to those in Google Ads, your email platform or your shop, because each system counts differently. Use them as an order of magnitude and a direction, not as accounting truth. Real money is checked against invoices and orders.

Consent, cookies and incomplete data

In the European Union, cookie-based measurement generally depends on the visitor’s consent. If some visitors refuse, you will not see all of your traffic, and the data will be an approximation. Google offers Consent Mode, which adjusts how tags behave according to the user’s choice. For visitors in the European Economic Area, the advertising-related signals (Consent Mode v2) are needed if you want to use audiences and remarketing in Google Ads. It has to be implemented correctly, together with the cookie banner; check Google’s current requirements.

The information in this article is indicative and is not legal advice. For compliance with GDPR and cookie rules, consult a lawyer or a DPO, and see Google’s official documentation at support.google.com/analytics.

Common mistakes with GA4

• Retention left at the short default, so the history needed for year-on-year comparison is lost.
• Marking every event as “key”. The reports become useless.
• Counting a button click as a sale. Measure the real outcome, not the intention.
• Your own traffic not excluded. Your team can inflate the visits.
• The code installed twice (in the theme and through a plugin), producing duplicate page views.
• Inconsistent campaign names in UTM tags.
• A single administrator, who then leaves the company.
• Decisions based on three days of data, instead of trends over several weeks.

How we go about it

When we take over a website, we begin with a check: what is measured, what is missing, what is duplicated. Then we agree with you the three to five key events tied to your business goal and test each one before relying on the figures. The monthly report is short: sources, results, what we learned and what comes next.

Measurement is part of conversion rate optimisation (CRO), because you cannot improve what you cannot see. If you would like help with setup or with reading the data, write to us through the contact page. And if you want to see what happens after the click, all the way to the sale, GA4 data can be linked to a custom CRM.

In short

• GA4 is event-based; mark only three to five key events.
• Day one: 14-month retention, an internal traffic filter, links to Ads and Search Console.
• Each month, read five reports: traffic, pages, events, purchases, tech.
• Tag your links with UTM, consistently.
• Ignore what does not support decisions: demographics, daily swings, complex explorations.
• The data is approximate, especially without full consent.