Basically you use them at points where you’d usually put a period, but you don’t want to add as much of a pause.
ETA:
For example
My wife said she would like tea; coffee would have been my choice.
could also be written as
My wife said she would like tea. Coffee would have been my choice.
but it wouldn’t sound as nice.
Am I misreading their comment or is everyone else? The top level comment said “The love of a woman pales in comparison to …”, meaning the love of a woman is less valuable. The gp comment says " clearly you’re not married". Since they’re arguing against the top level comment, they are arguing against the love of a woman being less valuable. So they’re saying the love of a woman is more valuable. So they’re saying “wife good”.