Wondering Joe wrote:
The earth's atmosphere is our first line of defense from falling
asteroid. There is no atmosphere in the moon. If you telescope the
moon you'll see too many craters caused by asteroids falling in the
moon. Unlike the International Space Station it can evade the
asteroid. Space station in the moon they'll need to install missiles
to protect it from dropping asteroids.

Nope.

Most of the craters on the moon happened billions of years ago.
There simply arn't that many large rocks hitting the moon today.
Most are pretty small, and would cause little more than tiny holes,
rather than destroying large areas.

Radiation shielding is needed, however this may well do double duty
as debris shielding.
You pile small lunar rocks and dust over your lunar base, so that it
covers it to a few feet depth.

Alternatively, there is good evidence that quite large lava tubes
exist on the moon intact.
You may be able to place your base inside one of these.