Jill was struggling to understand the book her friends loved. She remembered that two heads are better than one, and asked Jacob for assistance. Jacob explained the words that Jill didn't understand, and Jill began to love the book, too.

What is the meaning of the adage or proverb two heads are better than one?

Animals with two heads think faster than those with one.
Be careful about what friendly advice you follow.
It is good to solve problems independently, without help.
It is helpful to have advice and ideas from others.