For Develop Magento to custom Module we have to create some necessary files.
We have to registered all Module in Magento so that we can easily Enable or Disable Module and not effect to other module as well during customization and rectify and error or issues.

For example: app/code/Vendor/module

Steps:

Create the folder of module app/code/Vendorname/modulename
Create etc/module.xml file
Create etc/registration.php file
Enable the module
Cammand

php bin/magento setup:upgrade

Manifest Desires-Click Here