The 1st house is the most visible house, the first impression of a person, it shows the appearance, manner of behavior, style, instinctive reaction to the surrounding world.
The Moon has 2 poles, either it is passive, a childish position that requires care and attention - here a person with the Moon in the 1st house can be in the position of a child, be capricious. Or the maternal pole, caring towards others, close ones. For such a person, family life is very important, as a person manifests through caring for their loved ones.
The Moon is receptive, so it feels the space around it well, it depends on it. Therefore, in this position of the Moon, a person can be sentimental, sensitive, and may be tearful, especially if the Moon is in Water Signs or has aspects to Neptune.
With the Moon in the 1st house, a person does not like to strain, can be inert.
With this position of the Moon, a person has a close connection with the mother. In a male chart, the importance of a woman is colossal for a person, as a guide to family and can depend on both the mother and the wife. But it also depends on the level of the woman, she wants to bind the man to herself, or on the contrary make him strong, independent.
The appearance can give flabbiness, roundness, fullness. Even if the body is toned, one can see plump cheeks on the face, the eye cut may be such as overhanging and in general such a pleasant childishness.