I recommend you to install HAUNV88_Base module via composer. It is easy to install, update and maintaince.
Run the following command in Magento 2 root folder.
composer require haunv8888/module-base
php bin/magento setup:upgrade
php bin/magento setup:static-content:deploy
composer update haunv8888/module-base
php bin/magento setup:upgrade
php bin/magento setup:static-content:deploy
Run compile if your store in Product mode:
php bin/magento setup:di:compile