ruin vs spoil

[jctgf]

"can it get/be ruined?"
"can it get/be spoiled?"

hi,

I would like to know the difference between these verbs. do they mean basically the process of changing from a good state to a bad one?
how should I use them?
how shouldn't I use them?

thanks.

 

[Anglika]

Ruined means completely trashed and unusable; spoiled means damaged but not necessarily to the point of no return.

The watercolour painting fell into the bath and as a result was ruined.

The effect of his decoration was spoiled by his use of a virulent green on the ceiling.