Google Analytics 4 shows hundreds of metrics and it is easy to get lost in a sea of data that tells you nothing useful. But there are five to six numbers that genuinely tell you whether your marketing is working.
When Google moved to GA4, it changed not just the interface but the entire philosophy of measurement. Sessions are no longer the primary concept. Everything became 'events' and 'engagement'. Many business owners open GA4, see tables full of unfamiliar terms, and close it in frustration. This article is for them: a clear guide to which numbers to watch and what they actually mean for your business.
Engaged Sessions: a better signal than raw visit counts
GA4 replaced 'bounce rate' as a primary metric with 'Engagement Rate'. An Engaged Session is one that lasted longer than 10 seconds, or in which the user visited more than one page, or in which a key event (conversion) occurred. This is a far more realistic measure than a raw visit count.
If your Engagement Rate is below 40%, that is a signal that the wrong users are arriving, the content does not match expectations, or the landing page is slow or confusing. An Engagement Rate above 60% generally means there is alignment between what you advertise and what people find on the site. Look at this number by channel, not just in aggregate.
Conversions: the only metrics that speak directly to money
A conversion in GA4 is an event you have marked as important for the business. It can be a completed contact form, a purchase, a phone number click, a PDF download, or anything else that means the user moved closer to a sale. Without correctly configured conversions, GA4 is just a tool for counting visits.
Here is what must be set up: a conversion for every important action on the site (purchase, lead, booking), a conversion value where applicable (mandatory for e-commerce), and tracking by channel and campaign. After that you can calculate cost per conversion for every channel and make smart budget decisions.
- Set a conversion for every critical action: purchase, form, phone click
- Assign a monetary value to conversions wherever possible, GA4 will calculate ROAS automatically
- Verify conversions are firing correctly: submit a test form and confirm GA4 records it
GA4 full of data you do not understand is the same as GA4 that does not exist. The value is not in the volume of data but in the decisions you make based on it.
Acquisition report: where your customers actually come from
In the Reports menu, the Acquisition section tells you where users come from. But there are two levels: User Acquisition (the first time a user came to the site) and Session Acquisition (where they came from in this specific visit). For measuring the effectiveness of current campaigns, Session Acquisition is more relevant.
What you need to see in the Acquisition report is not just the number of users by channel, but Engaged Sessions and Conversions by channel. A channel that brings in lots of users but few conversions is expensive relative to what it costs. A channel that brings fewer users but a high conversion rate is your gold.
- Organic Search: how many conversions come from Google search without paid ads
- Paid Search: direct result of Google Ads campaigns, easy to track
- Direct: users who type your site directly or arrive without an attributed source
- Organic Social: free reach from social media, important for measuring content efforts
Engagement report: what they do once they arrive
The Pages and Screens report shows which pages get the most visits, but a visit alone is not enough. Track Average Engagement Time per page. If a blog post is read for an average of 8 minutes, the content is working. If a landing page that should convert users shows an average engagement time of 15 seconds, something is wrong with the page or the traffic reaching it.
Scroll depth is not tracked automatically in GA4, but it is easy to add as a custom event. This is especially useful for long blog posts and landing pages, because it tells you how far down users actually read. If 80% of users leave the page before reaching the CTA section, the problem is in the position and design of the call to action.
Technical health indicators to watch
The GA4 Tech report shows which devices and browsers users are on. This is directly tied to conversions, because if your site has a problem on iOS Safari and your audience mostly uses iPhones, you are losing conversions every day without immediately noticing.
Track Conversion Rate by device type. If the CR on mobile is half what it is on desktop, that is a signal that the mobile experience is not optimized. In a world where more than 60% of traffic comes from phones, mobile conversion rate is often the critical place where customers are being lost.
- Compare conversion rate on mobile versus desktop every week
- Check which browsers show the lowest engagement, it may indicate a technical issue
- Monitor page load time indicators that GA4 pulls from Core Web Vitals data
Exploration reports: when standard reports are not enough
GA4 has a powerful tool called Explore that lets you build custom reports. Funnel Exploration is particularly useful for e-commerce and landing pages: you see exactly which step users drop off at during the purchase flow. If out of 100 users who add a product to the cart only 12 complete the purchase, Funnel Exploration shows you exactly where those 88 disappear.
The izreklamiraj.me team helps clients set up GA4 correctly from day one and interpret data in a way that leads to concrete marketing decisions. Because data on its own has no value. The value is in understanding what it tells you.
If you want GA4 to start actually telling you what is working on your site and what needs fixing, izreklamiraj.me can set up the measurement system and interpret the findings. With over 10 years of experience and the position of the most innovative creative studio in the Balkans, we help clients build marketing on data, not assumptions. Visit us on the site and book your free consultation.
