The Text widget is one of the most commonly used widgets and is used to display paragraphs of text.

The Divider is used to add a line (several styles to choose from) to help break up content on a page.

The Spacer widget is used to create vertical space between widgets and typically editing manually, not within its design settings. 
The Form widget is used to create a form from scratch for customers to fill out on the website to collect customer information.
