What does it mean to read the line from the little finger to the wrist?

That's the success line. It would be better if there was a line between the ring finger and the wrist. That's the sun line, also called the career line. There is only a success line, but you can't see a career line, which means that although you can succeed, you may not be as perfect as you wish. It depends on whether there is a line in the way, otherwise you will encounter a villain or a mistake in doing things.