If it has not already been created, you need to create a Google Tag Manager account and a container.
Tag Manager overview (support.google.com)
Setup and install Tag Manager (support.google.com)
After that, simply copy the scripts provided when creating the Google Tag Manager container into the theme's skeleton.html file (from Backoffice > Ecommerce > Theme > Edit HTML/CSS).
Insert the code snippet <script> into the <head> element, preferably next to the opening <head> tag, but after any statements in the dataLayer.
Then insert the code snippet <noscript> immediately after the <body> tag.
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