YouTube has a free documentary about Richard Feynman. It was good, I recommend it. Back in 2005 I read several of the books available at the time on Feynman. The documentary gave a good summary.
Below are some Feynman quotes.
The first principle is that you must not fool yourself and you are the easiest person to fool.
It doesn’t matter how beautiful your theory is, it doesn’t matter how smart you are. If it doesn’t agree with experiment, it’s wrong.
For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.
We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.
If books are your thing – the Feynman book I would recommend starting with would be: Surely You’re Joking, Mr. Feynman! (Adventures of a Curious Character)