Remember, if you want to know how we calculate a metric, just go over the tooltip 
If you have the Polar Pixel, you will see information about attribution data:
Your Acquisition page is where you will see all your Marketing KPIs.
This page is split into the following sections:
Blended Performance:
This is the source of truth. It's all your marketing spend and your total sales.
Channel and Campaign Performance
This report uses the Polar Pixel to help you easily attribute purchases to your marketing sources. You can customize the report by applying different filters, such as changing the attribution model (e.g., First or Last Click) or adding additional metrics by a specific Channel.
If you're not yet using the Polar Pixel, the report will rely on the tracking pixels from the marketing sources you have connected. Please note, this method may result in higher or lower total conversions, as multiple sources might claim credit for the same conversion, or someone may convert after viewing an ad without clicking on it.
Pixel Channels Only Filter
The Pixel channels only toggle is enabled by default. This toggle adds a filter that excludes orders from sales channels that can not have the Polar Pixel, including POS and Subscription orders. By filtering these out we provide a clearer view into the impact from your marketing sources.
Campaign Insights
The campaigns shown in this report are not a full list of all your Facebook and Google campaigns. Here we only displays campaigns that meet the ROAS and Ad Spend filters you’ve set.
If your dashboard appears empty, it means there are no campaigns that fall within the limits you've applied.
Customer Journeys
With the Polar Pixel, you can visualize customer journeys to see the paths customers took before making a purchase, based on the attribution model you've selected.
You can also apply filters to Channel or Campaign Touchpoints, to view multi-touch customer journeys.
Key Traffic Metrics
This is data coming from Google Analytics.