How do you use a computer monitor for an fpv monitor?

Long story short, i have a computer monitor i would like to use as an fpv screen. Use to fly a lot, life happens. But really now a days I have strapped an fpv camera to some tiny rc cars and I run my dogs through the house on rainy days to tire them out. I have fpv goggles and an old screen. But I have an extra computer monitor and was wondering how I could use it for fpv.