Query related to Database and Sending of data from one page to another

Kindly help us in solving the below 2 queries.

1.Can you kindly explain us the Database setup when we create an application with the help of Bubble. As of now, I am currently using the free version and doesn’t have any DB plugin with me,
I want to understand regarding this.

  1. How will I send a data from one page to another in the same session?

Thanks