When something is unimportant
It doesn’t matter.
It makes no difference.
It makes no nevermind. (folksy)
= It doesn’t matter to me.
It don’t make (me) no nevermind (folksy)
It’s six of one, half a dozen of the other.
= It doesn’t matter which one or which way.
It’s not important.
It’s not worthwhile.
It’s not worth your while.
It’s not worth a hill of beans.(idiomatic)
It’s not worth mentioning.
It’s not worth the trouble.
It’s not worth it.