As I mentioned in the intro article you may not need to use Google Tag Manager on your website.
In this article I try to give you some advice so that you can decide whether you need all this or not.
If you are a blogger who only uses Google Analytics to track visitors and actually nothing more, you may not need Google Tag Manager on your website since replacing one tag with another tag does seems to be meaningless. However if you plan to use other tools like Google Ads, Facebook Ads, Pinterest Ads, etc, you might want to consider switching to Google Tag Manager.
If you are not a programmer, you have to know that each and every ad system and measurement system that you plan to use gives you different tracking codes even for the same purpose. If you are using Google Tag Manager (using GTM4WP) you can let Google Tag Manager to handle what exact command needs to be fired for each system. You “just” need to setup your tags and tag options (like account IDs) on a fancy UI at tagmanager.google.com
You do not have to code in most cases since GTM4WP does this for you! You only have setup your tags on Google’s website and that’s it! No programming needed!
If you are running a magazine using WordPress it is recommended for you to switch since you may using not just Google Analytics or any other kind of visitor tracking tool but other tags like remarketing, etc.
I think it is clear know that if you are running an e-commerce website you have many reasons to migrate too. Analytics tags, PPC tags, conversion codes and so on can be tracked very easily. Furthermore if you are using WooCommerce on your website, GTM4WP can give you many interesting features: it can send e-commerce data to be tracked in Google Analytics and you can also send data to Google Ads to track detailed ecommerce purchases and product data.