GA4 is installed on your site. The code is in place, data is starting to come in. You open the interface: and you face a dozen menus, hundreds of metrics, and an interface that looks nothing like what you knew.
Good news: 80% of what you need to know lives in 5 reports. The rest, you'll learn when a specific need arises.
Before you start: understand the logic of GA4
GA4 revolves around a central concept: events. Every user action (page view, click, scroll, purchase) is an event. Some events are collected automatically, others are configured manually.
It's different from Universal Analytics which was organised around sessions and page views. That changes how you read the reports: but it also makes them more precise.
Report 1: Overview (Reports > Overview)
Where to find it: left menu → Reports → Overview
This is the starting dashboard. It gives you at a glance:
- Active users over the last 28 days
- Revenue (if e-commerce is configured)
- Sessions
- Engagement rate
- The main acquisition channels
What you look at first: the active-users curve and its trend. If it climbs, things are generally going in the right direction. If it drops sharply on a precise date, you need to investigate (tracking outage, technical issue, Google penalty).
Tip: change the comparison period in the top right corner: always compare to the same period last year rather than the previous period, to avoid seasonal effects.
Report 2: Acquisition > Traffic acquisition overview
Where to find it: Reports → Life cycle → Acquisition → Overview
This report answers: where do your visitors come from?
The main channels you'll see:
- Organic Search: visitors who clicked on a non-paid Google result
- Direct: URL typed directly or unidentified source
- Organic Social: clicks from social networks (non-sponsored posts)
- Paid Search: Google Ads
- Referral: links from other sites
- Email: clicks from newsletters
What you look at: the split and how it evolves over time. If Organic Search is under 20% of your traffic after 6 months of content, SEO is not yet performing. If Direct dominates at 80%, your audience knows you but you aren't attracting new visitors yet.
To dig deeper: click "User acquisition" to see the exact source (Google, Facebook, specific newsletter, etc.) rather than just the channel.
Report 3: Engagement > Pages and screens
Where to find it: Reports → Life cycle → Engagement → Pages and screens
This report answers: which pages get the most visits?
The important columns:
- Views: total number of times the page was viewed
- Users: number of distinct people who viewed it
- Average engagement time: time actually spent on the page (excluding the last page of the session)
- Engagement rate: share of visits to this page that were engaged
What you look at: the gaps. If your pricing page gets lots of views but engagement time is 15 seconds, visitors don't find what they're looking for. If your blog post has few views but 4 minutes of engagement time, that's an excellent quality signal.
Tip: sort by "Users" to see reach, then by "Average engagement time" to find the content that holds attention.
Report 4: Acquisition > User acquisition (source / medium)
Where to find it: Reports → Life cycle → Acquisition → User acquisition
This is the most useful report to understand where new visitors specifically come from.
The difference with the overall acquisition report: this one breaks down by source / medium (google/organic, facebook.com/referral, etc.) rather than by channel. You see exactly which site or search engine brought visitors in for the first time.
What you look at:
- The share of google/organic: that's pure SEO
- Unexpected sources (an article that mentions you, a directory that referenced you)
- Paid campaigns: with cost if Google Ads is linked to GA4
Why it matters for a freelancer: if you run campaigns for a client, this is where you measure the real impact of each source and justify budgets.
Report 5: Conversions (Reports > Engagement > Conversions)
Where to find it: Reports → Life cycle → Engagement → Conversions
This report answers: are visitors doing what you want them to do?
Before it becomes useful, conversion events must be configured in GA4. These are business-value actions:
- Contact form submission
- Phone-number click
- Purchase (if e-commerce)
- Newsletter sign-up
- Document download
If no conversion is configured, that's the first thing to do after reading this article. GA4 automatically collects some events (page_view, scroll, click) but none are marked as conversions by default.
How to mark an event as a conversion: Admin → Property → Conversions → Create a conversion event → enter the name of the event already collected. The complete walkthrough is in the GA4 conversions guide.
Classic mistakes GA4 beginners make
Looking at data too early
GA4 needs data to be meaningful. Before 30 days of collection, numbers fluctuate too much to draw conclusions. Before 3 months, trends aren't reliable. Patience.
Comparing UA and GA4
If you had Universal Analytics before, don't compare the numbers. The methodologies are fundamentally different: sessions, users and page views are not calculated the same way. GA4 generally produces lower user counts and slightly different session counts.
Ignoring the processing delay
GA4 data has a 24 to 48 hour lag before it's complete. Yesterday's data is often incomplete. Always work on data older than 48 hours for reliable analyses.
Confusing "users" and "sessions"
A user can have multiple sessions. If you announce "1,000 visitors" while GA4 shows 1,000 sessions, you might overestimate the real reach. Use "active users" when talking about reach.
Where to start concretely
If you've just installed GA4:
- Week 1: check that tracking works (Reports → Real time: you should see yourself as an active visitor)
- Weeks 2-4: look at the Overview every 2-3 days to get familiar with normal variations
- Month 1: configure your conversions (without this, GA4 doesn't measure what matters)
- Months 2-3: start analysing the 5 reports above with a full data period
- Month 4+: start drawing actionable conclusions and integrating them into your client reports
If you produce GA4 reports for clients every month, NarratIQ automatically extracts the key metrics from these reports and presents them in a structured PDF, without you having to navigate the GA4 interface every time.