Intro
Google Tag Manager: https://tagmanager.google.com
Tag Assistant: https://tagassistant.google.com/
Google Analytics: https://analytics.google.com
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app. Once the small segment of Tag Manager code has been added to your project, you can safely and easily deploy analytics and measurement tag configurations from a web-based user interface.
https://support.google.com/tagmanager/answer/6102821?hl=en


Tag Manager container
A collection of tags, triggers, variables, and related configurations installed on a given website or mobile app is called a container. A Tag Manager container can replace all other manually-coded tags on a site or app, including tags from Google Ads, Google Analytics, Floodlight, and 3rd party tags.
https://tagmanager.google.com/#/home
Google Analytics Properties
Data Streams
Each Google Analytics 4 property can have up to 50 data streams (any combination of app and web data streams, including a limit of 30 app data streams).
A data stream is a flow of data from a customer touchpoint (e.g., app, website) to Analytics.
https://support.google.com/analytics/answer/9303323

Subdomains

Setup and install Tag Manager
https://support.google.com/tagmanager/answer/6103696?hl=en
Install Google Tag Manager to configure and deploy tags, including tags from Google Ads, Google Analytics, Floodlight, and 3rd parties.

Install and Setup Google Tag Manager in WordPress
https://www.wpbeginner.com/beginners-guide/how-to-install-and-setup-google-tag-manager-in-wordpress/
Another tutorial can be seen here:
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