CBX on Joomla
What is specific to Joomla — where the menu lives, the CBX menu item types that build your storefront, and clean URLs.
CBX on WordPress
What is different when your CBX store runs on WordPress — logging in, the menu, and putting CBX content on your pages.
CBX on Magento 2
Where CBX lives in the Magento admin, why the menu is shorter — and where the full Magento documentation is.