Install the necessary code snippets for your website's Google Tag Manager container – adgoji

Steps

Go to https://tagmanager.google.com.
Sign in to your Google Account.
Open the Tag Manager container you want to edit.
In the Workspace tab, select your container ID (which starts with 'GTM').
In the Install Google Tag Manager dialog, follow these steps for each page of your website:

Note: If your website is built using a website builder or content management system (CMS)
like Wordpress, Shopify, or Wix, you can set up the Google tag with an integration that 
doesn't require you to update the code on each page of your website.
Learn how to install the Google tag with a website builder or CMS

a. Copy the first block of code and paste it as high in the <head> tag as possible.

Example
In the following sample HTML code, you would paste your first Google Tag Manager code snippet after the opening <head> HTML tag. Note that the following example uses 'GTM-ABCDEFGH,' but you must replace the ID with your container ID.

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <!-- Google Tag Manager -->
        <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
        new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
        j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
        'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
        })(window,document,'script','dataLayer','GTM-ABCDEFGH');</script>
        <!-- End Google Tag Manager -->

        <title>Example Webpage</title>
    </head>
    <body>
        <!-- Content of your website -->
        <h1>Welcome to My Website</h1>
        <p>This is a sample paragraph on my webpage.</p>
    </body>
    </html>

b. Copy the second block of code and paste it immediately after the opening <body> tag.

Example
In the following sample HTML code, you would paste your second Google Tag Manager code snippet immediately after the opening <body> HTML tag. Note that the following example uses 'GTM-ABCDEFGH,' but you must replace the ID with your container ID.

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <!-- Google Tag Manager -->
        <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
        new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
        j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
        'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
        })(window,document,'script','dataLayer','GTM-ABCDEFGH');</script>
        <!-- End Google Tag Manager -->

        <title>Example Webpage</title>
    </head>
    <body>
        <!-- Google Tag Manager (noscript) -->
        <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-ABCDEFGH"
        height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
        <!-- End Google Tag Manager (noscript) -->

        <!-- Content of your website -->
        <h1>Welcome to My Website</h1>
        <p>This is a sample paragraph on my webpage.</p>
    </body>
    </html>

c. Test your website by entering your website's link and then clicking Test.

6. Click OK.

Steps

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