This star is also known as Beta Herculis, so it is obviously in constellation Hercules.
The brightest star is Beta Hercules, or Kornephoros with magnitude 2.78. However, it is NOT the largest. Hercules contains several clusters, each with hundreds of thousands od stars, some of which may be larger. Furthermore, the constellation also contains the Hercules–Corona Borealis Great Wall, which is the largest known structure in the universe,
Every constellation contains stars.
Lyra. Vega is its brightest star.
Vega is the brightest star in the constellation Lyra, the Harp.
Gemini is a constellation, not a single star. The constellation contains 80 stars which appear in the Bayer/Flamsteed catalogues.
Betelgeuse, or Alpha Orionis, is a red supergiant and second brightest star in the constellation Orion.
orion
Orion. See link.
Constellation
The cluster is in scorpius.
Cassiopeia
Ursa Major is the constellation. The 2 stars in the bowl of the dipper point to Polaris. Polaris IS the North Star.