Minimal working Magento 2 module example

Just enough files to start Your Magento 2 module development. Based on Magento 2.3.4 CE.

Create directory structure:
- In Your app/code directory create Your vendor/module directories, example: ExampleVendor/ExampleModule

Create etc directory and add module.xml file:
- app/code/ExampleVendor/exampleModule/etc/module.xml

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="ExampleVendor_ExampleModule"/>
</config>

Create registration file:
- app/code/ExampleVendor/exampleModule/registration.php

Create registration file:
- app/code/ExampleVendor/exampleModule/registration.php

<?php

use Magento\Framework\Component\ComponentRegistrar;

ComponentRegistrar::register(
    ComponentRegistrar::MODULE,
    'ExampleVendor_ExampleModule',
    __DIR__
);

Add composer.json:
- app/code/ExampleVendor/exampleModule/composer.json

{
    "name": "example-vendor/module-example",
    "description": "Example module description",
    "type": "magento2-module",
    "version": "1.0.0",
    "autoload": {
        "files": [
            "registration.php"
        ],
        "psr-4": {
            "ExampleVendor\\ExampleModule\\": ""
        }
    },
    "authors": [
        {
            "name": "Your Name",
            "email": "[email protected]",
            "homepage": "https://example.com/",
            "role": "Developer"
        }
    ]
}

Last, but not least, add Your README file where You will put your module description:
- app/code/ExampleVendor/ExampleModule/README.md

# Example module

Run module enable and setup upgrade with Magento 2 CLI:

$ bin/magento module:enable ExampleVendor_ExampleModule
$ bin/magento setup:upgrade

After installation, Your module will be added to app/etc/config.php as item in modules array
If You are working in git flow, Yoou need to add app/etc/config.php to your commit

Your final directory structure should look like this:

app/code/ExampleVendor/ExampleModule
├── composer.json
├── etc
│   └── module.xml
├── README.md
└── registration.php

Start coding!