How to Use Reactive Programming in a Spreadsheet

The book club on top and dev.com slash book club, I'm not going to give you a pitch, but you can go sign up. Anyway, we're reading pragmatic programmer and they talked about reactive programming as an example of that. This cell depends on this cell, right? And so when you call the use signal, do you do create signal like, and then passing the value in the other cell? And then when you update the signal,Do you have some other function that pulls it for like, how do you manage the reactivity that way?