The Moon, the part of your chart that tracks what you need to feel safe and how you react before you think, sits in the 11th house: the house of friends, groups, and the hopes you hold with other people. The short version is that your sense of safety lives in your group. When the people around you are close and warm, you feel steady. When they are distant or scattered, something in you registers it as a low alarm, even if nothing has gone wrong by any reasonable measure.
The 11th house is linked with Aquarius and its ruler Uranus, so there is always a slight current of the unexpected running through it. Groups form, splinter, reform. The Moon here means your inner weather, those pre-thought reactions and needs, is tuned directly to that current.
One thing worth knowing before reading further: house placements depend on an accurate birth time. If you are working from an approximate time, the Moon's house may shift. The sign the Moon is in stays the same regardless.