The first star that is visible in the evening sky can vary depending on several factors, such as the time of year, the viewer's location, and the prevailing atmospheric conditions. However, the star commonly referred to as the "evening star" or the "first star" is often the planet Venus.
Venus is the brightest planet in our solar system and is frequently visible shortly after sunset or before sunrise, depending on its position in its orbit. Due to its brightness, Venus is often mistaken for a star, and its appearance as the first "star" in the evening sky has led to its association with this title.
It's important to note that Venus is not a star but a planet. If you are referring specifically to stars, the identity of the first star visible in the evening sky can vary and is highly dependent on the observer's location and time of year. Stars like Sirius, Capella, and Vega are often prominent and visible early in the evening at different times of the year, but there isn't a specific star universally recognized as the first star seen each night.