yellow
The French word for yellow is "jaune". It is used to describe anything that has a yellow color, such as a yellow flower or a yellow shirt. In French, the word "jaune" is also used in a variety of expressions and idioms, such as "avoir un cœur jaune" (to be a coward) or "être jaune de jalousie" (to be green with envy).
The car is yellow
It's a simple sentence stating the color of a car. In French colors normally come after the noun they describe, different from in English.
The sky is sometimes yellow at sunset
This sentence describes the color of the sky during certain times. In French, it's common to describe scenarios in a more poetic or expressive way.
I like yellow, it's a cheerful color
This is an expression of personal preference. Here, the speaker is expressing a fondness for the color yellow, and stating their opinion that it is a cheerful color.