To go where? A rock we call the moon? There’s nothing there.
Likely nothing on Mars either.
You’re right; there isn’t.. until we get there.
Any outpost or colony will have to become as self-sufficient as possible, since just getting there is the most expensive part. The Apollo program to the moon should be used as an example of what NOT to do.
Expanding the habitat for humans is good. And then there’s ‘commanding the high ground’, and all that.