Why some stars are red and some stars are blue

A star's colour is related to its surface temperature.

Why Are Stars Different Colors? - Universe Today

StellarNet Celebrates 30 Years of Developing Intelligence from Light! - StellarNet, Inc.

EarthSky Why are stars so bright on winter nights?

Red, White & Blue! Stars Cluster in Festive Cosmic Portrait

Lighting Up the Universe - Bell Museum

Stars Causes of Color

Colour of Stars

Webb Snaps Highly Detailed Infrared Image of Actively Forming Stars - NASA

A complete guide to star Betelgeuse in Orion - BBC Sky at Night Magazine

Why is the sky blue?