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Magento 2: How to add custom script to head tag?

There are two ways to add custom script to head tag in Magento 2:
  1. add custom script through admin-panel
  2. add custom script through XML
    1. If you want to add custom script in head tag through admin-panel, just login to the admin and browse the navigation Content => Design => Configuration, Now click on edit link of current theme and Go to HTML Head tab and inside scripts and style sheets text-area you can enter your custom script.
    2.  If you want to add custom script through XML, just create a XML file on following location:
      app/design/frontend/packagename/themename/Magento_Theme/layout/default_head_blocks.xml
      and add the following code in this XML to call template file:
      <?xml version="1.0"?>
      <page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
      <body>
              <referenceBlock name="head.additional">
                  <block class="Magento\Framework\View\Element\Template" name="header_tags" template="Magento_Theme::html/header/head_tags.phtml"/>
              </referenceBlock>
          </body>   
      </page>
      Now create a template file on following location:
      app/design/frontend/packagename/themename/Magento_Theme/templates/html/header/head_tags.phtml
      and add script in this file, which you want to display in head tag.
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