What is the brightest star in the northern hemisphere?

The bright star you see next to the moon is Jupiter.

My answer to your question is: Sirius is the brightest star in the sky and Venus is the brightest star.

In the northern hemisphere (China), Sirius, located in Canis Canis, is the brightest star in this season and the brightest star in the sky. We learned Orion in junior high school. Orion is the representative constellation of the winter sky, and Sirius is in the lower left corner of Orion. Secondly, Venus is the brightest planet in the sky, but because Venus is an inner planet with a low altitude angle, it often appears in the western sky (Pleiades) after sunset or in the eastern sky (morning star) before sunrise. The second brightest planet is Jupiter. You can see it in the sky. It is closer to the moon. Because Jupiter (like other planets) is very close to the trajectory of the moon in the sky, sometimes the moon and Jupiter will be very close. In some years, the moon, Venus and Jupiter will also have the astronomical landscape of double stars accompanying the moon