Magento 2 file/folder permissions setting
https://magehit.com/blog/magento-2-file-folder-permissions-setting/
Magento 2: Run Unit Tests
https://devdocs.magento.com/guides/v2.3/config-guide/cli/config-cli-subcommands-test.html
Install M2E PRO via Magento Marketplace
https://docs.m2epro.com/display/InstallationUpgradeMagento2/via+Magento+Marketplace
M2E Pro - installation options
https://docs.m2epro.com/display/InstallationUpgradeMagento2/Home
Magento 2: Cron Configuration
https://firebearstudio.com/blog/magento-2-cron-configuration.html