When you click on the (+) button, you can add two types of cell
- Content
 - Component
 

1. Content
You will be able to insert nine types of content cells:
- Text
 - Image
 - Text + Image
 - Space
 - Register button
 - Button
 - Video
 - Title
 - Image grid
 

2. Components
You can insert 6 types of components:
- Agenda
 - Contact
 - Map
 - Countdown
 - Album
 - Event description
 

Articles that migh interest you:
- How to add "text" content?
 - How do I add the "Image" content?
 - How do I add the "Text+image" content?
 - How do I create spaces with the "Space" content?
 - How do I add the "Register button" content?
 - How do I add the "Video" content?
 - How do I add the "Button" content?
 - How do I add the "Title" content?
 - How do I add the "Image grid" content?
 - How to add the "Agenda" component?
 - How do I add the "Contact" component?
 - How do I add several Google maps?
 - How do I add a "Countdown" component?
 - How do I add the "Album" component?
 - How do I add the "Event description" component?