Which of the twelve constellations knows others best?

I think Gemini understands others because he is a warm constellation that can help others solve problems, and he knows a lot about the world, so he is a constellation that can understand others.

Pisces is because it is a good listening sign. Understanding people includes not only understanding, but also listening. Sometimes complaining about troublesome things is much better, so I think Pisces is also a sign that others can understand.

There is also Libra, which is a constellation with a particularly high emotional intelligence. He is tactful and can help you find a solution, so he can understand others better.

The above is my opinion, I hope it will help you.