This is the simple module for adding custom customer attribute in magento2 open source.
- Download an archive of the repo and unzip it
- Copy and paste it to Magento instance root directory/app/code
- Run the upgrade commands on the root of Magento instance to install our module.
php bin/magento setup:upgrade
php bin/magento setup:static-content:deploy -f
php bin/magento indexer:reindex
php bin/magento cache:flush