These are general tips but each survivor is different. Ultimately, the most important thing is to ask them what makes them feel comfortable.
Ask if they prefer to be called a victim, survivor, or both.
Respect boundaries and be mindful of body language or facial expressions.
Create a safe space and allow them to share their story without fear or judgment or critical comments.
Thank them for sharing and reinforce that they are free to share as much as they want.
Don't give any advice or counsel of what you think the victim should have done. It's rude and most likely, repetitive to the harmful rhetoric survivors are forced to hear by their community.