In Magento 2, There are many default widgets available in native.
You can check the list of the widget from Magento Opensource by Admin panel.
Go To Content -> Elements -> Widgets
Name of widgets which are an available default,
CMS Page link, CMS Static Block, Catalog Category Link, Catalog New Products List, Catalog Product Link, Catalog Products List, Orders and Returns, Recently Compared Products, Recently Viewed Products Continue reading “Magento 2 Create Custom Category Widget.”