Prologues.

In what situation would you use a prologue or what situation would you specifically avoid using one.

Whale, I tend to avoid using one unless trying to give info about what could not be explained in the story but was important.

I use a prologue for all of the above reasons, and I avoid using one if I know that I have an epilogue planned.

Okay so the general rule is no prologues unless ABSOLUTELY necessary
I don't do prologues, but maybe a lil introduction… Like…. You're about to be thrown into the story. Have fun. Bye. Don't die.