Dejan Batanjac

It is worth to mention that WordPress doesn’t have Google Analytics support out-of-the-box. 
To add the Google Analytics code for your WordPress website you need to relay either on the WordPress theme or plugin.
Once you installed the plugin, please navigate to the Settings section in the WordPress dashboard.
From the Settings section select Google Analytics Setup and add your tracking 
code. From now on, on all your website pages you will have the tracking code 
enabled.
Also check <a href="https://github.com/dejanbatanjac/ga-analytics" rel="nofollow ugc">GA Analytics on Github</a>. 
NOTE: It requires at least WordPress 4.5.
Here is the <a href="https://www.google.com/analytics" rel="nofollow ugc">link to Google Analytics</a>.

GA Analytics

A handy way to insert full Google Analytics tracking code on all pages.

George Stephanis

<a href="https://www.google.com/tagmanager/" title="Google Tag Manager" rel="nofollow ugc">You can sign up for a Google Tag Manager account here.</a>
This plugin makes it even easier to use Google Tag Manager, adding all the code itself — all you need to do is provide the Account ID!
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/KRvbFpeZ11Y?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

Google Tag Manager

I know there's been a lot of frustration with this plugin in the past, but after making the plugin author aware of Google's change to how the Tag Manager scripts should be loaded, he's updated the plugin and it works great.

I've tested version 1.0.2 of the plugin by dynamically injecting a Google Analytics script through the Google Tag Manager (which didn't work properly in version 1.0.1) and it now works perfectly!

Works Great After Update

Does what it says, inserts just the GTM code at the right time at the right location.

Fell in love with the simplicity of this plugin, wonder why it does not show up in top when looking for GTM plugin for WP.

Had to mess around with so many other plugins before I found it. All other related plugins are too complex, and slows down the site as well. This plugin does what its supposed to do and nothing else :)

"LESS is MORE"

Kudos to the author for such a beautiful implementation.

One suggestion though, if there would have been a single "do_action" with some custom action, before printing the GTM code, could make it easier to add some custom JS variables, if needed, to pass along to GTM, rather than printing them at wp_head with priority 9.

Love it

The Google Tag Manager plugin adds a field to the existing General Settings page for the ID and outputs the javascript to make it work.

GA Analytics vs Google Tag Manager