GA4 for Beginners: Everything You Need to Know to Get Started

Google Analytics 4 (GA4) can feel overwhelming when you first open it. The interface is different from what you might be used to, the terminology has changed, and it’s easy to get lost in a maze of reports you don’t understand.

This guide is for you if you’re a business owner, marketer, or anyone who needs to understand their website data but doesn’t have a background in analytics. I’ll show you what matters, where to find it, and what to set up so your data is actually reliable.

Who Is This Guide For?

• Business owners who want to understand their website performance
• Marketers who need to track campaign results
• E-commerce store owners who want to know what’s driving sales
• Anyone who just set up GA4 and thinks „now what?“

You don’t need to be technical. You don’t need to understand code. You just need to know where to look and what the numbers mean.

What Is GA4?

Google Analytics 4 is Google’s current analytics platform. It replaced Universal Analytics (UA) in July 2023, and it works quite differently from its predecessor.

GA4 vs. Universal Analytics: Key Differences

Feature	Universal Analytics (old)	GA4 (current)
Data model	Session-based (pageviews)	Event-based (everything is an event)
Cross-device	Limited	Built-in (tracks users across devices)
Privacy	Cookie-dependent	Designed for a cookieless future
Machine learning	Basic	Advanced (predictive audiences, anomaly detection)
Reporting	100+ pre-built reports	Fewer default reports, more customization
Bounce rate	Central metric	Replaced by „Engagement rate“
Goals	Goals & Transactions	„Key Events“ (formerly called Conversions)
Free data retention	Unlimited	2 or 14 months (configurable)

Why Did Google Make the Switch?

Three main reasons:

1. Cross-device tracking. People browse on their phone, research on their laptop, and buy on their tablet. Universal Analytics struggled with this. GA4 uses user-centric measurement to connect these touchpoints.

2. Privacy regulations. GDPR, CCPA, and the decline of third-party cookies required a fundamentally different approach to analytics. GA4 is designed to work with less data through machine learning and modeled data.

3. Event-based flexibility. In Universal Analytics, tracking anything beyond pageviews required custom code. In GA4, everything — page views, clicks, video plays, file downloads, scrolls — is treated as an event, making tracking more flexible.

Navigating GA4: Where to Find What

When you open GA4, you’ll see these main sections in the left sidebar:

Home

Your dashboard overview. Shows key metrics at a glance — users, new users, engagement time, and revenue (if e-commerce is set up). Good for a quick pulse check.

Reports

This is where you’ll spend most of your time. Pre-built reports organized by:

• Acquisition: How people find your website (organic search, paid ads, social, direct)
• Engagement: What people do on your site (pages viewed, events triggered)
• Monetization: Revenue data (for e-commerce)
• Retention: How well you keep users coming back

Explore

Advanced analysis tool for custom reports. More powerful than standard reports, but has a steeper learning curve. You can create funnels, path analyses, and custom data explorations.

Advertising

Attribution reports showing how your marketing channels work together. Useful if you run ads across multiple platforms and want to understand the full conversion path.

Quick Reference: „I Want to Know X — Where Do I Find It?“

What You Want to Know	Where to Find It in GA4
How many people visited my site?	Reports → Acquisition → Overview
Where do my visitors come from?	Reports → Acquisition → Traffic Acquisition
Which pages are most popular?	Reports → Engagement → Pages and Screens
How long do people stay?	Reports → Engagement → Overview
Which campaigns drive sales?	Reports → Acquisition → Traffic Acquisition (filter by campaign)
What’s my conversion rate?	Reports → Engagement → Key Events
Are mobile users converting?	Reports → Tech → Tech Overview (compare by device)
What’s the path to purchase?	Explore → Funnel Exploration

5 Key Metrics You Must Understand

1. Users

The number of unique visitors to your website in a given period. GA4 distinguishes between:

• Total users: All unique users
• New users: First-time visitors
• Active users: Users who had an engaged session (the default „Users“ metric)

What it tells you: How many people are actually visiting your site. Watch for trends — steady growth is good, sudden drops need investigation.

2. Sessions

A session starts when a user visits your site and ends after 30 minutes of inactivity. One user can have multiple sessions.

What it tells you: Total visit volume. If you have 1,000 users and 1,500 sessions, your average user visits 1.5 times — indicating some level of return visitation.

3. Engagement Rate

This replaced bounce rate and is arguably a better metric. Engagement rate measures the percentage of sessions that were „engaged“ — meaning they lasted more than 10 seconds, had 2+ page views, or triggered a key event.

Benchmarks:

• 50–70%: Good for most websites
• 70%+: Excellent
• 40–50%: Needs improvement
• Below 40%: Problem — investigate why users leave so quickly

What it tells you: Are people actually engaging with your content, or are they landing and immediately leaving? A low engagement rate on a key landing page signals a mismatch between what users expect and what they find.

4. Average Engagement Time

How long, on average, users actively engage with your site during a session. Unlike the old „session duration,“ this only counts time when your site is in the foreground (active browser tab).

What it tells you: The quality of your traffic and content. High engagement time on blog posts means people are actually reading. Low engagement time on product pages might mean the information isn’t compelling enough.

5. Key Events (Conversions)

The most important metric for your business. Key Events are specific actions you define as valuable — purchases, form submissions, phone calls, sign-ups, etc.

What it tells you: Whether your website is actually achieving its purpose. Everything else is a supporting metric — Key Events are the bottom line.

4 Must-Do Settings (Do These Immediately)

1. Change Data Retention to 14 Months

By default, GA4 stores your detailed data for only 2 months. After that, you can only see aggregated reports — you lose the ability to do detailed analysis in the Explore section.

How to change it:

1. Go to Admin → Data Settings → Data Retention
2. Change „Event data retention“ from 2 months to 14 months
3. Enable „Reset user data on new activity“
4. Save

Why it matters: Without this change, you can’t compare this January to last January in detailed explorations. You lose historical granularity that’s essential for understanding trends.

2. Enable All Enhanced Measurement Events

Enhanced Measurement automatically tracks common interactions without any code changes. Make sure everything is turned on.

How to check:

1. Go to Admin → Data Streams → Select your stream
2. Click „Enhanced measurement“
3. Ensure ALL toggles are enabled:

• Page views
• Scrolls
• Outbound clicks
• Site search
• Video engagement
• File downloads
• Form interactions

3. Exclude Unwanted Referrals (Payment Gateways)

This is a critical step that the vast majority of e-commerce sites miss — and it can seriously distort your data.

The problem: When a customer goes to PayPal, Stripe, or another payment gateway to complete a purchase, they leave your site. When they return after payment, GA4 records the payment gateway as the traffic source. This means your purchase gets attributed to „paypal.com“ instead of the Google Ads campaign that actually drove the sale.

How to fix it:

1. Go to Admin → Data Streams → Select your stream
2. Click „Configure tag settings“ → „List unwanted referrals“
3. Add all your payment gateway domains:

• paypal.com
• stripe.com
• Your bank’s payment page domain
• Any other third-party checkout domains

Impact: Without this fix, up to 20–30% of your transactions may be incorrectly attributed, making it impossible to accurately evaluate your marketing channels.

4. Set Up Key Events (Conversions)

GA4 doesn’t track conversions by default — you need to tell it what counts as a conversion for your business.

For e-commerce:

• Purchase (if using GA4 e-commerce tracking)
• Add to cart
• Begin checkout

For lead generation:

• Form submission (contact form, quote request)
• Phone number click
• Email click
• Chat initiation

How to set up:

1. Go to Admin → Key Events
2. Mark relevant events as Key Events
3. If the event doesn’t exist yet, create it via Google Tag Manager

Why it matters: Without Key Events, GA4 is just a traffic counter. You see that people visit, but you have no idea if they’re doing anything valuable. This single setup step transforms GA4 from „interesting data“ to „business intelligence.“

3 Common Mistakes That Ruin Your Data

Mistake 1: Leaving Data Retention at 2 Months

As covered above, the default 2-month retention means you can’t do year-over-year analysis in Explore reports. This is such a common issue that it’s worth repeating: change this setting immediately after creating your GA4 property.

Fix: Admin → Data Settings → Data Retention → 14 months.

Mistake 2: Not Setting Up Conversions

A GA4 property without Key Events is like a cash register that counts customers walking in but doesn’t track sales. You’ll see how many people visit, but you won’t know if your website is actually working.

Fix: Define your Key Events within the first week of GA4 setup. At minimum, track your primary business goal (purchase, lead, signup).

Mistake 3: Not Excluding Payment Gateways

This is the most damaging mistake for e-commerce sites. When payment gateways show up as traffic sources, your entire attribution model breaks. You can’t trust which campaigns drive revenue, and you’ll make bad decisions based on bad data.

The shocking reality: In my experience, roughly 80% of e-commerce sites have this problem. It means their marketing attribution data is fundamentally unreliable.

Fix: Add all payment gateway domains to the unwanted referrals list. Verify by checking if payment providers appear in your traffic acquisition report after the change.

Quick GA4 Setup Checklist

Use this checklist to make sure your GA4 is properly configured:

• [ ] GA4 property created and tracking code installed on all pages
• [ ] Data retention changed to 14 months
• [ ] Enhanced measurement: all events enabled
• [ ] Unwanted referrals: payment gateways excluded
• [ ] Key Events defined (at least your primary conversion)
• [ ] Google Ads linked (if running ads)
• [ ] Google Search Console linked
• [ ] Internal traffic filtered (your own IP addresses)
• [ ] Cross-domain tracking configured (if you have multiple domains)
• [ ] E-commerce tracking implemented (if applicable)

Summary Table

Topic	Key Takeaway
What is GA4	Event-based analytics platform, successor to Universal Analytics
Key difference	Everything is an event; cross-device tracking built in
Most important metric	Key Events (your defined conversions)
Engagement Rate benchmark	50–70% is good, below 40% is a problem
Data Retention	Change from 2 months to 14 months immediately
Biggest e-commerce mistake	Not excluding payment gateways from referrals
Enhanced Measurement	Enable all toggles — it’s free data

Next Steps

1. Log into your GA4 and check the 4 must-do settings above. Fix anything that’s not configured correctly.
2. Set up your Key Events if you haven’t already. This is the single most impactful thing you can do.
3. Bookmark the „where to find it“ table and reference it until navigation becomes second nature.
4. Schedule a monthly check-in — spend 30 minutes reviewing your key reports and looking for trends.

Need help setting up GA4 correctly or understanding your data? Contact me for a professional setup and walkthrough.

Written by Martin Bradac — PPC & SEO specialist with 9+ years of experience managing €80K+/month in ad spend.