You can use a template for a form or unique features you want to use more often on a website. The template is built with sections and widgets and can be placed on a page using the 'Templates section'. The big advantage here is that you only have to manage a template in one place.
Curious about what sections are and how it works? Then read Sections - How does it work?.
Creating the template
Go to 'Content' > ' Templates'.
Create a new template and give it a name.
Build the template with sections and widgets.
Place template on the page
Go to the page to which the template is to be added.
Click '+ Section' and choose 'Template section'.
Select the template you just created and add it.