"The actions of a lightning page will allow those who can access the lightning page to create and upload records, send emails, and create a task. For those who do not know, a lightning page is a specific home page for a specific app program. It is typically used with the Salesforce or Lightning Experience apps.
This page is specific to those two brands, but the ideas of that page are more or less universal across most business apps. Other than that, the lightning page only does one other thing. It will adapt to whatever device the user is on. If you’re on a phone, it will adapt to fit your phone screen. The same goes for a tablet or a laptop."