Variable, Data Detail, and Session Storage Manager

Hello,

Good day!
I would like to ask for help on some of my questions.

Can you please correct me if I am wrong?
From my understanding, I can set the value of any of the 3 objects on a page:

1. variable
2. data detail key
3. session storage manager item

…to any item from a selected table’s row?

And if possible,

1. What are their differences and their acceptable usage?
2. Which values will persist and can be reused if the page has been refreshed?

Thank you in advance.