Are you facing a problem related to the performance of your Magento store? The store owners have many challenges on a daily basis to maintain higher rankings on search engines. They create a store by adding custom JavaScript and CSS in the Magento 2 to make the layouts attractive. 
The basic components of the Magento store include containers, blocks, and layouts.
<ul>
<li style="font-weight: 400;" aria-level="1">The structure of a web page is known as the layout </li>
<li style="font-weight: 400;" aria-level="1">The container represents the placeholder inside the web page structure</li>
<li style="font-weight: 400;" aria-level="1">Blocks represent the UI components or controls inside the container placeholders</li>
</ul>
Magento developers are familiar with the basic view of Magento storefront pages and the process involved in the Magento 2 Migration. To get secure and stable <a href="https://www.elsner.com/magento-2-migration-services/">customization during Magento 2 Migration</a> do not change the theme layout.  The Magento application processes in the layout files like:
<ul>
<li style="font-weight: 400;" aria-level="1">Module base files are loaded </li>
<li style="font-weight: 400;" aria-level="1">Module area files are loaded</li>
<li style="font-weight: 400;" aria-level="1"> Collect the layout files from the modules. The orders are determined based on the  orders of modules from the app/etc/config.php file </li>
<li style="font-weight: 400;" aria-level="1">Determining the sequence of the inherited themes like [&lt;pare_theme&gt;,…,&lt;parent1_theme&gt;] &lt;current_theme&gt;</li>
<li style="font-weight: 400;" aria-level="1">Iterates the sequence of the theme from the last to the latest: 
&#8211; Add the extending theme layout files into the list 
&#8211; Replace the overridden layout files on the list</li>
</ul>
<ul>
<li style="font-weight: 400;" aria-level="1">Merges the layout files from the lists</li>
</ul>
<h2 id="1-adding-static-files">Adding Static Files</h2>
Any <a href="https://www.elsner.com/services/magento-development/">Magento 2 Development Company</a> will help in the Page configuration file in the &lt;head&gt; section that has static resources such as CSS and JavaScript. The file: 
App/code/Magento/Theme/view/frontend/layout/default_head_blocks.xml
This defines the look of &lt;head&gt; section in the Magento store. To add the CSS and JavaScript that are recommended to extend the file in the custom theme:
&lt;page xmlns:xsi = ”http://www.w3.org/2001/XMLSchema-instance”   xsi:noNamespaceSchemaLocaion = ”urn:magento:framework:View/layout/etc/page_cofiguration.xsd”&gt;
 &lt;head&gt;
&lt;!—Add local resources&#8211;&gt;
&lt;css src=”css/my-stylesc.css”/&gt;
&lt;!&#8211;The Following two ways toad local JavaScript files are equal &#8211;&gt;
&lt;script src=”Magento_Catalog::jssample1.js”/&gt;
&lt;link src=”js/samplejs”/&gt;
&lt;!—Add External Resources&#8211;&gt;
&lt;css src =”https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css” src_type=”url”/&gt;
&lt;script src = “https://maxcdn.bostrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js” src_type=”url”/&gt;
&lt;link rel = “stylesheet” type = ”text/css”  src”http://fonts.googleapis.com/css?family=Montserrat” src_type=”url” /&gt;
&lt;/head&gt;
&lt;/page&gt;
To add the external resources you will have to specify the argument value:
src_type=”url”
The command &lt;link src = ”js/sample.js”/&gt; or &lt;script src = “js/sample.js”/&gt; can be used to add the locally stored JavaScript file in the theme. The following locations specify the path to assets:
<ul>
<li style="font-weight: 400;" aria-level="1">&lt;theme_dir&gt;/web-</li>
<li style="font-weight: 400;" aria-level="1">&lt;theme_dir&gt;/&lt;Namespace&gt;_&lt;Module&gt;/web-</li>
</ul>
<h2 id="2-removing-static-files">Removing Static Files </h2>
The static assets that are linked in the page &lt;head&gt; to be removed, one can make changes in the theme extending:
App/design/frontend/&lt;Vendor&gt;/&lt;theme&gt;/Magento_Theme/layout/default_head_blocks.xml 
Like the following coding:
&lt;page xmlns:xsi = “http://www.w#.org/2001/XMLSchema-instance” xsi:noNamespaceSchemaLocation = “urn:magento:framework:Viewayout/etc/page_configuration.xsd”&gt;
&lt;head&gt;
&lt;!—Remove local resources&#8211;&gt;
&lt;remove src = “css/style-m.css” /&gt;
&lt;remove src = “my-js.js” /&gt;
&lt;remove src = “Magento_Catalog::js/compa.js” /&gt;
&lt;!&#8211;Remove External Resources &#8211;&gt;
&lt;remove src = “https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css”/&gt;
&lt;remove src = “https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js”/&gt;
&lt;remove src = “http://fonts.googleapis.com/css?family=Montserrat”/&gt;
&lt;/head&gt;
&lt;/page&gt;
The module path needs to be specified when you add or remove static assets like:
Magento_Catalog::js/sample.js.
<h2 id="3-customizing-the-js-and-css-in-magento-2">Customizing the JS and CSS in Magento 2</h2>
<h3 id="4-magento-2-css-customization">Magento 2 .css Customization </h3>
Sometimes small changes are required to alter themes and modules to fit the business requirements. Let us look at an example to change the CSS for <a href="https://store.elsner.com/">theme and extensions</a>: 
<ul>
<li style="font-weight: 400;" aria-level="1">Add the below code into the wp_custom.less for example to hide the search box from the store header. Custom CSS can be easily added in the file:</li>
</ul>
          .block-search {display: none;}
<ul>
<li style="font-weight: 400;" aria-level="1">Regenerate The theme LESS/CSS and flush the Magento cache and changes will be reflected in the storefront.</li>
</ul>
<h3 id="5-magento-2-js-customization">Magento 2 .js Customization </h3>
The project sometimes requires adding specific .js customization. Installing a sample module can be done by:
<ul>
<li style="font-weight: 400;" aria-level="1">Copying the module under the app/code/</li>
<li style="font-weight: 400;" aria-level="1">php bin/Magento module:enable Custom_Js &#8211;clear –static-content</li>
<li style="font-weight: 400;" aria-level="1">php bin/Magento setup:upgrade</li>
<li style="font-weight: 400;" aria-level="1">php bin/Magento ca:cl</li>
</ul>
Add the custom .js code into the:
App/code/Custom/Js/view/frontend/web/js/customjs.js
<h2 id="6-conclusion">Conclusion</h2>
You will need <a href="https://www.elsner.com/hire-magento-developer/">experienced Magento developers</a> that can help in upgrading or Magento 2 Migration effortlessly.

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