GA4 in 30 minutes: what a business owner needs to know (and what to ignore)

Why you open GA4 and understand nothing

You open Google Analytics 4, see dozens of reports, a chart of "active users in the last 30 minutes" and a menu that seems to change every time. You close it. That is what happens to most business owners — and it is not their fault. GA4 was built for analysts, not for someone who wants to know three things: where customers come from, what they do on the site and what brings in money.

This lesson gives you exactly that. The basic model, four reports, two settings and two links. The rest can wait.

Everything is an event

In the old Google Analytics you had "pageviews" and, separately, "events". In GA4 everything is an event: loading a page is the page_view event, a click on an outbound link is click, scrolling to 90% is scroll, an order is purchase. Every event can carry parameters: the page it happened on, the order value, the form name.

Why this matters to you: if you want to know how many people submitted the contact form, someone has to send an event when the form is submitted. If the event does not exist, GA4 does not guess. And if you want that event to count as a business result, you mark it as a key event — formerly a "conversion". Google renamed the term in 2024 so it stops being confused with Google Ads conversions.

The 4 reports that matter

1. Acquisition → Traffic acquisition. Where sessions come from: Organic Search, Paid Search, Direct, Organic Social, Referral, Email. This answers "which channel brings me people".
2. Engagement → Pages and screens. Which pages get visited and how long people stay. This shows whether your services page is read or merely opened.
3. Engagement → Events / Key events. How many forms, calls, orders. If the report only shows page_view and scroll, your tracking measures nothing that makes money.
4. Landing page (also under Engagement). Which page people enter on first and how much of that traffic reaches a key event. This is where you find pages that receive paid traffic and do not convert.

With these four reports you can answer most of the questions you have. Explorations, funnels and segments are for later.

What "users" and "sessions" really mean

This is where many owners lie to themselves, so it is worth two minutes.

• A user in GA4 is, in practice, a browser with a cookie. The same person on phone and laptop = two users. The same person who clears cookies = a new user. When you see "1,200 users", read "roughly 1,200 browsers, probably fewer people".
• The number shown by default is active users — those for whom GA4 recorded engagement (a session over 10 seconds, two pages or a key event) or a first visit. It is not "everyone who touched the site".
• A session starts when someone lands on the site and ends after 30 minutes of inactivity (the default). It does not end at midnight and a new one does not start if the person comes back from a different campaign within the same half hour — a difference from the old GA.

How to read the channel report without lying to yourself

You open Traffic acquisition and see: Organic Search 2,400 sessions, Paid Search 900, Direct 1,100. The temptation is to say "SEO works best". Three corrections:

• Direct often means "I don't know". Links from WhatsApp, from apps, from emails without UTM, from documents — they all land in Direct. If Direct is large, you have a labelling problem, not loyal customers.
• Sessions are not money. Add the key events column and the key event rate per session. A channel with 900 sessions and 45 forms beats one with 2,400 sessions and 20.
• Unassigned means GA4 could not place the traffic in any channel — usually because of misspelt UTM parameters (for example utm_medium=fb instead of paid_social).

Two settings and two links to make today

1. Data retention: Admin → Data collection and modification → Data retention. The default for event-level data is 2 months. Change it to 14 months, the maximum for standard properties. Otherwise, when you want to compare this year with last year in an exploration, the data will be gone. Standard aggregated reports are not affected; explorations are.
2. Thresholds: if you see a notice that a report is affected by thresholding, GA4 is hiding rows with few users to protect demographic data. It is normal on small sites; it is not a tracking error.

The links

• Google Ads (Admin → Product links → Google Ads): GA4 key events can be imported as conversions into Google Ads, and campaign cost appears in GA4. Without the link, the two systems do not talk.
• Search Console (same menu): brings organic search queries and the pages that appear in Google into GA4. It is the only source for "what people search when they find me".

Both require admin rights in both accounts and take a few minutes.