A menu plays an important role in navigating customers around your website so that they can find the things they want. And it should contains links to category pages, product pages, CMS pages or any page to fulfill this role.
In this post, we'll introduce you to 4 types of links you can add to a menu item in Ninja Menus, a drag & drop Magento 2 mega menu extension.
https://www.magezon.com/magento-2-mega-menu.html

1. Open the edit page of a menu, then open Menu Builder tab.
2. Hover over the menu item you want to add a link. Then click Edit in the drop-down list to open the menu item's settings.
3. In General tab, you can find Type drop-down where you will see 4 link types to add to the menu item:
- Custom Link: if you choose this, you can enter an URL in the Custom Link field.
- Category Link: if you choose this, you can search and choose an existing category in Category drop-down.
- Product Link: if you choose this, you can search and choose an existing product in Product drop-down.
- CMS Page Link: if you choose this, you can search and choose an existing CMS page in Page drop-down.
Remember to save after finishing.