How to create an extension for Magento 2

I want to create an extension to Magento 2, but I cannot find any information. I need to create an extension that can be installed in Magento 2 by downloading from the store or following the link. Please share information.

How to create an extension for Magento 2

I want to create an extension to Magento 2, but I cannot find any information. I need to create an extension that can be installed in Magento 2 by downloading from the store or following the link. Please share information.