Listen to people who have a lot to learn from.
That said, they don't have to be smart. Each person is good at something in their own way and can share their experience with you.
Listen to the stories of travelers, ask the older generation for advice, take an interest in the hobbies of friends, read books, and it doesn't matter if this work with the title "Self-discovery" or "Romantic meeting", you can take away something from both yourself.
Incredible, but to read and be interested in things. And after reading, think over everything you read, analyze, perhaps, make some notes for yourself. It is much easier to become smarter than it is to become wiser.