There are multiple types of components you can use in a Custom template. You may be wondering what each component looks like as you edit content. To preview different components visit the link below:
https://xd.adobe.com/view/bae22e37-02a6-4f8e-b5da-426b756eb037-efb1/grid
Please reach out to the Marketing Office web team if you're considering a new component on your web page. We will guide you through functionality, layout options and editing requirements in Cascade.