The module is a directory that contains blocks, controllers, models, helper, etc - that are related to a specific business feature. In Magento 2, modules live in app/code directory of a Magento installation, with this format: app/code/<Vendor>/<ModuleName>.

In our case this is app/code/Encomagestore/CustomWidget.

Our module has name Encomagestore_CustomWidget. It works on Magento 2 and displays three random simple products with an image, a name and a price in the left additional sidebar of each page of the Magento 2 Luma theme site.

• Step 1: Create a directory for the module like above format.
• Step 2: Declare module by using configuration file module.xml.
• Step 3: Declare widget by using configuration file widget.xml.
• Step 4: Register module by registration.php.
• Step 5: Enable the module with bin/magento module:enable Encomagestore_CustomWidget and php bin/magento setup:upgrade console commands.
• Step 6: Create a widget template file samplewidget.phtml.
• Step 7: Create a widget block class SampleWidget.php.
• Step 8: Create frontend layout with default.xml and styling with random.css.
• Step 9: Flush cache with php bin/magento cach:clean command.

If you have followed all above steps, you will see the title 'Random Products' in left additional sidebar and three random simple products from the site store with an image, a name and a price in each of them.