How to distinguish stars by size and color?

Stars have several colors, the color of a star can tell with high accuracy about the composition of a star and its temperature.
color and temperature of stars:
(Temperature in K)
30,000 – 60,000 – Blue
10,000 – 30,000 – White – blue
7500 – 10000 – White
6000 – 7500 – Yellow – white
5000 – 6000 – Yellow
3500 – 5000 – Orange
2000 – 3500 – Red
300 – 500 – Brown
Extremely small stars – most often brown dwarfs with low temperatures
The second type of small stars – white dwarfs, this is the last stage of the evolution of sun-like stars, are distinguished by high density.
Large stars – Red giants with low temperatures (3000 – 5000 K), but with enormous luminosity.