GA4 guide
Google Analytics 4 for beginners: what PMs and DAs need to know
GA4 is the most widely used analytics tool in the world. Learn the essentials — events, conversions, audiences, and reports — without a data science degree.
What is GA4 and why learn it?
Google Analytics 4 is Google's free analytics platform used by more than 95% of websites. It tracks how users find your product, how they use it, and where they leave.
For product managers, GA4 answers the questions that matter most: Which features do users actually use? Where do they drop off? Which channels bring the users who convert?
For data analysts, GA4 is the data source you will pull from constantly. Understanding how it works makes every downstream analysis — in BigQuery, Looker, or a spreadsheet — faster and more accurate.
How GA4 is different from Universal Analytics
Universal Analytics (UA) was the previous version of Google Analytics, sunset in 2023. If you learned analytics before 2023, GA4 works very differently.
Event-based, not session-based
Universal Analytics grouped everything into sessions. GA4 tracks individual events, giving you much more granular data on exactly what users do.
Web and app in one property
GA4 tracks both your website and mobile app in a single property, so you get a unified view of user behavior across platforms.
BigQuery integration
GA4 connects natively to Google BigQuery, which means analysts can write SQL against raw event data — no more sampling or aggregation limits.
More privacy-friendly
GA4 is built around cookieless measurement and consent modes, making it better suited to today's privacy regulations (GDPR, CCPA).
Key GA4 concepts
Before you open GA4, understand these six terms. They appear in every report and every conversation about analytics.
Events
Every user interaction is an event: page view, button click, video play, purchase. In GA4, events are the fundamental unit of measurement — everything is an event.
Users
People visiting your site or app. GA4 distinguishes new users (first visit ever) from returning users (have visited before), which tells you whether you're growing or retaining.
Sessions
A group of interactions a user makes within a time period. One user can have many sessions. Sessions help you understand visit patterns rather than just raw user counts.
Conversions
Events you mark as important business goals — signup, purchase, lead form submit. GA4 lets you designate any event as a conversion so you can track what actually matters.
Dimensions
The 'what' of your data: page URL, traffic source, country, device type, browser. Dimensions describe the context of a user action.
Metrics
The numbers: total users, sessions, engagement rate, revenue, average session duration. Metrics measure how much or how often something happens.
5 reports every PM and DA should know
GA4 has dozens of reports, but these five cover the vast majority of what you'll actually need in your day-to-day work.
Acquisition Overview
Where users come from — organic search, paid ads, social media, or direct visits. This tells you which channels are working and where to invest.
Engagement Overview
Which pages and screens users visit, how long they stay, and how many interactions they make. Surface your best-performing content.
Retention
Do users come back? The retention report shows what percentage of users return after their first visit — a key signal of product or content stickiness.
Conversion events
Are users completing your goals? Signups, purchases, lead form submits. This is the report that connects traffic to business outcomes.
Funnel exploration
Where in the flow do users drop off? Define the steps (landing page → signup → checkout → purchase) and see exactly where you're losing people.
Getting hands-on with real data
The fastest way to learn GA4 is to explore a real property. Google provides a free demo account connected to the Google Merchandise Store — a live e-commerce store with real traffic and real conversions.
How to access the demo account
- 1
Go to analytics.google.com and sign in with a Google account
- 2
Click Admin in the bottom-left corner
- 3
Select Demo Account from the account picker at the top
Practice exercises to try
How many users visited the store last month? Find the answer in Reports → Overview.
What was the top acquisition channel? Check Acquisition → Overview.
Which landing page drove the most sessions? Look in Engagement → Landing page.
Free learning resources
GA4 has a strong ecosystem of free learning material. Two resources stand out above the rest.
Google Analytics Academy
Google's official free certification course. Covers GA4 setup, reports, and exploration tools. Completing it earns a Google-recognized certificate that you can add to your LinkedIn profile.
Measure School on YouTube
Practical, step-by-step GA4 tutorials from one of the most trusted analytics educators on YouTube. Great for visual learners who want to see real GA4 setups in action rather than read documentation.
Keep building
Build your analytics skills in the DA or PM track
GA4 is a core tool in both the Data Analyst and Product Manager learning paths. Each track shows you how to use it in the context of your actual role.