Uninstallation

Check this article for a common actions list: https://nwdthemes.com/2016/07/12/magento-2-uninstall-module/

• remove the folder app/code/Nwdthemes/Powerbanners
• drop module tables from database
  
  DROP TABLE IF EXISTS `nwdthemes_powerbanners_style`; DROP TABLE IF EXISTS `nwdthemes_powerbanners_banner_store`; DROP TABLE IF EXISTS `nwdthemes_powerbanners_banner`; DROP TABLE IF EXISTS `nwdthemes_powerbanners_slider`;

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  DROP TABLE IF EXISTS `nwdthemes_powerbanners_style`; DROP TABLE IF EXISTS `nwdthemes_powerbanners_banner_store`; DROP TABLE IF EXISTS `nwdthemes_powerbanners_banner`; DROP TABLE IF EXISTS `nwdthemes_powerbanners_slider`;

• remove the config settings
  
  DELETE FROM core_config_data WHERE path LIKE 'nwdthemes_powerbanners%'

  1	DELETE FROM core_config_data WHERE path LIKE 'nwdthemes_powerbanners%'

• remove the module from app/etc/config.php
• remove the module from database table setup_module
  
  DELETE FROM setup_module WHERE module='Nwdthemes_Powerbanners'

  1	DELETE FROM setup_module WHERE module='Nwdthemes_Powerbanners'

• flush cache
  
  php bin/magento cache:flush

  1	php bin/magento cache:flush

• recompile code if you are in production mode
  
  php bin/magento setup:di:compile

  1	php bin/magento setup:di:compile