The Setup Wizard can be used to easily install, uninstall, and manage modules, as well as upgrade your installation and make changes to the web setup. For detailed information about installing an extension, see General CLI installation in the Magento Extensions Guide.
The Web Setup Wizard is being deprecated in Magento 2.3.6 and will be removed in Magento 2.4.0. After it is removed, you must use the command line to install or upgrade Magento, as well as extensions.
Important: Always flush the cache after installing or upgrading Magento, or any extensions and modules.
Module Manager lists the components and modules that are currently installed in your Magento system.
The System Upgrade tool can be used to upgrade your installation of Magento. During the process, it checks your system for readiness, creates a backup, and then upgrades your system.