Assets¶
The Assets folder contains public resources. If you are familiar with the directory structure of extensions, this would be the Resources/Public folder. In composer-mode this folder will be symlinked and published in the public _assets folder. This is the place where you can put your CSS, JavaScript or image files inside. In order to include these in your template, you must use custom Content Block ViewHelpers.
Icon.svg¶
This is the icon for the Content Type. There is a fallback to a default icon, but it is recommended to replace it with your own, custom icon. You can find many official TYPO3 icons here. Allowed file extensions are svg, png and gif (in preferred order).