They are fundamental particles that other particles like protons and neutrons are made of. To the best of hour knowledge the are fundamental patterns that can’t be broken down more.
The spin has a bit to do with the regular rotation of the object. It has really more to how the particle interacts magnetically with the surroundings.
The color change is a property quarks and gluons have that relates do the strong interaction. It has nothing to do with colors as we normally use it. It is an analogy because of how the combined effect of the property of multiple particles. It is a bit like how color mixing works. So tool to help explain int and make it a bit easier to talk about.
You can compare it to feeling blue is an ideom to describe sadness.
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