Mastering Google Analytics 4 (GA4) in 2025

The world of PPC is ever evolving: case in point, we’re already five years into the GA4 era. While the dust has mostly settled, some marketers are still finding their feet as the platform continues to develop and update over time. 

The transition from Universal Analytics in 2023 marked more than just a platform swap; it was a complete shift in mindset. Sessions, bounce rates, and familiar reports are out. Events, engagement metrics, and machine learning are in.

Welcome to the new standard of PPC analysis. GA4 is here to stay, so let’s get you up to date with everything you need to know about Google Analytics 4 in 2025 and beyond.

• GA4 in 2025 - Where we are now
• Key differences from Universal Analytics
• Metrics that matter in GA4
• Setting up events and conversions properly
• Custom reports and explorations
• GA4 and Data Privacy

GA4 in 2025 - where we are now

Since UA was sunsetted in 2023, GA4 has become the universal standard for all web analytics in the Google ecosystem.

All businesses and marketers must now use GA4 for tracking user interactions, conversion paths, and performance metrics. It’s quickly become the standard, a requirement for any modern marketer. 

Several key legacy features from UA are still missing or reimagined in GA4, making training and upskilling a priority.

Many users are still adjusting to:

• The absence of session-based data

• The shift to events for every interaction

• A more stripped-back default interface

The omission of these legacy standards within PPC have split some marketers, with many experienced PPC managers being understandably used to the systems and strategies of previous decades with UA.

But with these updates comes the introduction of new features and developments in GA4. For example, a recently introduced feature in 2025 is annotations, helping teams document campaign launches, website changes, or external factors that affect data.

Key differences from Universal Analytics

Event-based model vs. session-based
GA4 tracks all user interactions as events, not sessions or pageviews. This model provides more granular, flexible insights into specific actions taken by users. It also aligns more with modern marketing, which is more sophisticated and specific than just tracking specific events alone.

No bounce rate by default
Traditional bounce rate is not part of GA4’s core metrics (though it can be manually applied to data sets). It’s been replaced by more meaningful metrics like engagement rate, which measures the quality of interaction. 

Bounce rates are now determined by engaged vs non-engaged sessions. A non-engaged session is any session where the user doesn’t stay on the page for 10 seconds or doesn’t click anything on the page.

No views vs. pageviews distinction
UA used to separate “views” for apps and “pageviews” for websites. GA4 combines both into a streamlined event structure. This reflects GA4’s understanding of modern marketing, where single users paths to conversion often include desktop and mobile usage with equal impact and relevance.

GA4’s privacy-focused approach
GA4 has been built with privacy regulations in mind. As a result, there’s no IP tracking and limited data retention by default. Overall there’s a greater emphasis on user consent and data anonymisation. 

Metrics That Matter in GA4

Engagement metrics
Like we mentioned when discussing bounce rates earlier, in GA4, your given engagement rate reflects the percentage of engaged sessions (e.g. sessions lasting 10+ seconds, with a conversion, or with 2+ page views).

Engaged sessions per user is a strong indicator of user intent and quality.

Conversion tracking
Conversion tracking replaces UA’s “Goals” with more flexible, event-based “Conversions”. It requires explicit marking of an event as a conversion, allowing you to really highlight interactions that are the most important to your business goals.

First user vs. session scope
Metrics can now be analysed at the first user or session level, which can transform how you understand and interpret your data sets. User scope tracks data from the first interaction a user has with your site. Session scope tracks interactions within one session (usually a specified time-frame of around 30 minutes). Understanding your preferred scope is essential when interpreting reports and building audiences.

Predictive metrics
GA4 offers machine learning-based metrics, designed to help you get a sense of where your data might lead to in the coming days. (Please note, these are only available if your property meets minimum data thresholds.)

• Purchase probability estimates the likelihood of an active user making a purchase within the next 7 days.

• Churn probability considers the probability of an active user within the last 7 days not being active in the coming 7.

• Revenue prediction estimates the expected revenue from all purchase events in the coming 28 days, based on the user behaviour of the past 28 days.

Explorations tab and real-time data
This new tab known as “Explorations” allows for advanced custom reporting and visualisation. Its real-time dashboard offers improved accuracy and insight into live user behaviour.

Setting up events and conversions properly

Making the most of GA4 in 2025 and beyond relies on your understanding of how GA4 tracks interactions and user behaviour. Here’s the lowdown:

How GA4 tracks everything as an event
GA4 treats all interactions, from clicks to scrolls, as events. Events can be automatically collected, recommended, or custom. So when you set up your campaigns, it is vital to lead with your key marketing goals in mind. This is a huge benefit to the modern marketer; finally, you can give equal weight to a specific button click, form submission or simple page view, as per your marketing goals.

Recommended setup steps
Use Google Tag Manager (GTM) to manage event tracking efficiently. This is a tool designed to streamline your tracking process.

Configure essential events like:

• Form submissions

• Video plays

• Scroll depth

• Button clicks

Manually tag and name custom events clearly to avoid headaches later.

Marking events as conversions
In GA4, conversions must be manually designated in the admin settings. Clear naming conventions are essential for consistency and reporting clarity.

Importance of a tracking plan
Build a comprehensive measurement plan before implementation. The best system to begin your new campaigns with is through precise tracking. Define event names, parameters, and expected values to avoid confusion later.

Custom Reports & Explorations

One significant improvement of GA4 compared to Universal Analytics is its custom reporting options. Here’s what sets them apart:

Limitations of standard reports
GA4’s default reports are intentionally minimal and often not sufficient for deep analysis. Customisation is essential to unlock the platform’s full potential. Relevance is the key denominator here; the standard reports give you plenty of metrics, but what’s actually useful and relevant to your campaign and specific objectives?

Building reports that answer business questions
Use Explorations to create targeted reports like:

• Custom funnels (e.g., cart to checkout)

• Pathing reports (to understand user journeys)

• Segment overlaps (to compare audience behaviours)

Practical use cases
As a creative startpoint, here are some ways to use more advanced reports in your next campaign: 

• Visualise where users drop off in multi-step journeys.

• Identify top-performing traffic sources for specific conversions.

• Compare new vs. returning users and their behaviour paths.

Attribution in GA4
Your data is clearly influenced by your choice of attribution, so what are your options in GA4? The role that attribution plays is becoming increasingly essential to digital marketing, so it is vital to understand these updates.

Data-driven attribution as default
GA4 uses machine learning to assign value to each touchpoint in a conversion journey. You may remember the ill-fated last-click attribution model that was the standard of Universal Analytics. This new, data-driven, machine learning model is now the default and reflects real-world complexities of user behaviour more accurately than last-click.

Comparing models
You can still compare data-driven attribution with last-click, first-click, and linear and other rule-based models. Just use the Advertising > Attribution section to view assisted conversions, and explore multi-touch paths to help identify top contributing channels.

GA4 and Data Privacy

Privacy by design
GA4 is built to comply with modern privacy regulations such as GDPR and CCPA. Security is demanded by modern users, customers and businesses alike, so this evolution to a privacy-focused platform is essential in the modern marketing era.

Key features include:

• No IP address storage

• Limited data retention windows

• Enhanced consent controls

Consent Mode v2 integration
GA4 features the newly updated Consent Mode from Google; Consent Mode v2, as an automatic integration. It’s designed to allow websites to adjust how Google tags and Google Analytics behave in relation to their sites, based on what the user has agreed to.

But here’s the useful part. When a user clicks that they do not grant access to their data being used, you can still track totally anonymised data that is created using machine learning. In short, it replicates what it thinks the user would have done, based on previous similar users who did consent to have their data used.

Consent Mode v2 is essential for compliance in the UK and EU, and works with GA4 to respect user consent while still collecting anonymised, aggregated data.

GDPR compliance tips

• Regularly audit event data and user properties.

• Avoid collecting personally identifiable information.

• Inform users clearly via cookie banners and privacy notices.

• Further reading: PPC Glossary.

In Closing

GA4 isn’t just Universal Analytics with a fresh new look, it’s a fundamentally different approach to user data, behaviour and performance. It’s a platform that rewards users who take the time to customise and structure their campaigns with intention.

Whether you step more into the world of AI assisted PPC, consider an updated approach to data-driven attribution or level-up your reporting, the tools are all available at your fingertips.

Make 2025 the year you fully master GA4. It’s time to reap the benefits of this sophisticated platform.

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