We can make [oxygen from moon rocks](https://phys.org/news/2009-08-scientists-oxygen-moon.html).

There is [water on the moon](https://www.nasa.gov/mission_pages/Mini-RF/multimedia/featur...).

With oxygen, water, and power, we can make food.

Appropriate radiation shielding is a matter of construction, which could occur on the moon itself using local materials ideally, or building underground enough to be shielded.

Moon habitation is something that makes little sense for its own benefit, but immense sense in an orbital supply chain for... I dunno... harvesting a few trillion dollars worth of minerals.

Space exploration will not be easy. Navigating accurately across thousands of miles of ocean on [a homemade raft](https://en.wikipedia.org/wiki/Polynesian_navigation) with only a coconut named Wilson and your hands isn't easy either :)