I will leave the first video here as an embed - so that you can have an idea how it is structured and how it looks like:
An important note: I'm a co-creator of Analyzify app (https://apps.shopify.com/analyzify). However, the video series is NOT featuring Analyzify at all. It is solely prepared for store owner that wants to learn & use GTM and data-analytics on their own.
You can ask me any questions on this topic. Happy to answer!