What are the noteworthy constellations observed in winter?

Ursa major (commonly known as the Big Dipper), because it always keeps a certain position relationship with Polaris and keeps rotating. After the Big Dipper was found, it extended to the spoon mouth along the connecting line of two stars A and B on the spoon side, which was about five times the distance between the two stars A and B, and there was a brighter star, namely Polaris. In the area south of 40 degrees north latitude, the Big Dipper often rotates below the horizon, especially at dusk in winter, which is often invisible. At this time, we should look for the North Star according to the Hou Xian constellation opposite the Big Dipper. Hou Xian constellation consists of five stars with brightness similar to that of the Big Dipper, forming a "W" shape. In front of the middle of the W-shaped gap, about twice the width of the whole gap, you can find the Polaris. In the area south of 23 degrees north latitude, you can use the Southern Cross to determine the direction of the first half of the year. The Southern Cross is mainly composed of four bright stars connected diagonally to form a cross. It extends downward along the connecting line between two stars A and B, and it is located due south, which is about four and a half times the distance between the two stars.