How to add custom link in top navigation menu in Magento 2?

1) To define plugin, add below code

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Theme\Block\Html\Topmenu">
        <plugin name="custom_menu_item" type="Magemonkeys\AddCustomeMenu\Plugin\Topmenu" sortOrder="10" disabled="false"/>
    </type>
</config>

<?xml version="1.0"?>

</type>

</config>

in your app/code/Magemonkeys/AddCustomeMenu/etc/frontend/di.xml file.

2) Now, Create Topmenu.php Plugin file at app/code/Magemonkeys/AddCustomeMenu/Plugin/ and paste the below code :

<?php
namespace Magemonkeys\AddCustomeMenu\Plugin;
use Magento\Framework\Data\Tree\NodeFactory;
use Magento\Framework\UrlInterface;

class Topmenu {
    /**
     * @var NodeFactory
     */
    protected $nodeFactory;
    /**
     * @var UrlInterface
     */
    protected $urlBuilder;
    /**
     * @param NodeFactory  $nodeFactory
     * @param UrlInterface $urlBuilder
     */
    public function __construct(
        NodeFactory $nodeFactory,
        UrlInterface $urlBuilder
    ) {
        $this->nodeFactory = $nodeFactory;
        $this->urlBuilder = $urlBuilder;
    }
    public function beforeGetHtml(
        \Magento\Theme\Block\Html\Topmenu $subject,
        $outermostClass = '',
        $childrenWrapClass = '',
        $limit = 0
    ) {
        /**
         * Parent Menu
         */
        $menuNode = $this->nodeFactory->create(
            [
                'data' => $this->getNodeAsArray("CMS Pages", "cms-page"),
                'idField' => 'id',
                'tree' => $subject->getMenu()->getTree(),
            ]
        );
        /**
         * Add Child Menu
         */
        $menuNode->addChild(
            $this->nodeFactory->create(
                [
                    'data' => $this->getNodeAsArray("Abouts us", "abouts-us"),
                    'idField' => 'id',
                    'tree' => $subject->getMenu()->getTree(),
                ]
            )
        );

        $menuNode->addChild(
            $this->nodeFactory->create(
                [
                    'data' => $this->getNodeAsArray("Store Location", "store-location"),
                    'idField' => 'id',
                    'tree' => $subject->getMenu()->getTree(),
                ]
            )
        );

        $subject->getMenu()->addChild($menuNode);
    }
    protected function getNodeAsArray($name, $id) {
        $url = $this->urlBuilder->getUrl($id);
        return [
            'name' => __($name),
            'id' => $id,
            'url' => $url,
            'has_active' => false,
            'is_active' => false,
        ];
    }
}

<?php

namespace Magemonkeys\AddCustomeMenu\Plugin;

use Magento\Framework\Data\Tree\NodeFactory;

use Magento\Framework\UrlInterface;

class Topmenu {

/**

* @var NodeFactory

protected $nodeFactory;

/**

* @var UrlInterface

protected $urlBuilder;

/**

* @param NodeFactory $nodeFactory

* @param UrlInterface $urlBuilder

public function __construct(

NodeFactory $nodeFactory,

UrlInterface $urlBuilder

) {

$this->nodeFactory = $nodeFactory;

$this->urlBuilder = $urlBuilder;

}

public function beforeGetHtml(

\Magento\Theme\Block\Html\Topmenu $subject,

$outermostClass = '',

$childrenWrapClass = '',

$limit = 0

) {

/**

* Parent Menu

$menuNode = $this->nodeFactory->create(

[

'data' => $this->getNodeAsArray("CMS Pages", "cms-page"),

'idField' => 'id',

'tree' => $subject->getMenu()->getTree(),

]

);

/**

* Add Child Menu

$menuNode->addChild(

$this->nodeFactory->create(

[

'data' => $this->getNodeAsArray("Abouts us", "abouts-us"),

'idField' => 'id',

'tree' => $subject->getMenu()->getTree(),

]

)

);

$menuNode->addChild(

$this->nodeFactory->create(

[

'data' => $this->getNodeAsArray("Store Location", "store-location"),

'idField' => 'id',

'tree' => $subject->getMenu()->getTree(),

]

)

);

$subject->getMenu()->addChild($menuNode);

}

protected function getNodeAsArray($name, $id) {

$url = $this->urlBuilder->getUrl($id);

return [

'name' => __($name),

'id' => $id,

'url' => $url,

'has_active' => false,

'is_active' => false,

];

}

3) Output :

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