First, understand dimensions
As noted by Google, every report in Google Analytics is made up of dimensions and metrics. Dimensions are the attributes of your data, while metrics are quantitative measurements of particular aspects of your website.
Taken together, dimensions and metrics can help you build tables for data visualization. For example, you could look at the “Sessions” metric and compare it against the “City” dimension to see how many sessions you received from different cities in a pre-defined time frame.
In the contexts of this article, the KPIs you’ll want to focus on to measure your blog’s success will count as metrics when viewed in Google Analytics 4 and any related properties.Common KPI examples include “Active Users,” “Avg. Engagement Time,” “Engaged Sessions,” “Engagement Rate,” or any number of other measurable present in the metrics section of Google Analytics.
Without context, however, these metrics are just data. They only gain meaning when understood from the perspective of the dimensions they relate to. For example, if you want to understand whether a change to your website resulted in a higher or lower engagement rate among your users, you would look at the “Engagement Rate” metric from the perspective of dimensions such as “Page path + query string” (to look at performance across pages), “Default channel grouping” or “Source / medium” (to look at performance across acquisition sources), or “First user campaign” (to look at performance based on ad campaigns).
Importantly, you can use these dimensions to filter your Google Analytics 4 reports and gain a better understanding of your website data by creating Comparisons in the GA4 dashboard.