You don't have to pay to use Rails, BDD, Agile, or other tools and approaches. Certainly there are books and courses for sale, but also quite a lot of material

You don't have to pay to use Rails, BDD, Agile, or other tools and approaches. Certainly there are books and courses for sale, but also quite a lot of material for free. Saying "Here's a 'medicine,' it might work for you in some circumstances, but it's certainly not always appropriate, and by the way it's free, have as much as you like," is not the promotional pitch of a quack.