What is the central idea of the story about Justin's volunteer experience?

Justin had a great time volunteering at the local gym and wants to continue volunteering.

What is the central idea of Liz's texts with her mom?

Liz enjoyed volunteering at the animal shelter and wants to bring Fluffy, the bearded dragon, home.

Volunteering is a rewarding experience for both the giver and the receiver.

A central idea is a specific summary of events, while a theme is a universal message.

The central idea was that he enjoyed volunteering with the kids and found it rewarding.

I can distinguish between the central message and theme of a literary text.

1
The central idea of the conversation was that Liz enjoyed volunteering and wanted to bring a new pet home.
2
The speaker learned that volunteering is an awesome experience that is rewarding for both those receiving and those giving help.
3
The pet Liz wanted to bring home was not a kitten, but a bearded dragon named Fluffy.