Before Installion
bin/magento maintenance:enable
Installation
composer require ""
Upgrade
composer update ""
After upgrade or install
php bin/magento module:enable ""
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy
php bin/magento setup:static-content:deploy zh_Hans_CN
php bin/magento indexer:reindex
php bin/magento cache:flush
bin/magento maintenance:disable