Free software' is a matter of liberty, not price. To understand the concept, you should think of 'free' as in 'free speech,' not as in 'free beer'.
When I learn martial arts, my master will have me try a punch for a week and he will keep saying, 'No, you don't have it. No, that's not right. ' When he finally says, 'Yes, you did it,' it's a wonderful moment. You worked on it. You got it.