What are the common traits of highly intelligent people?

I know only few.

Infinite curiosity

The Secret to Creativity, Intelligence & Scientific Thinking | Buffer

Positive attitude (Never say die)

Believing in their stupidity

Physical exercise

Work out has been long known as a mood regulator and cognitive performance enhancer.6 Ways Exercise Makes You Smarter

Books

Can reading make you smarter?

Experiences like traveling

I quote none other than super star of creativity

“I heard about some kid that’s 14 on his way to Stanford, and that’s great,” Jobs said. “That’s sort of out of the ordinary, but you might want to think about going to Paris and being a poet for a few years. Or might wanna go to a third-world country. I’d highly advise that, and see people and lepers with their hands falling off and all that stuff. It’s very much, so worth doing.”

In 1982, Steve Jobs presented an amazingly accurate theory about where creativity comes from

https://www.youtube.com/watch?v=ymbD_a-G1IQ