IMHO, these are the best points thus far. They all speak to proper body alignment (what dancers call CPA). The importance of them... stand up straight and tall, and slightly forward over the arches of the feet. The absolute essential thing to 'walking' once you have all of this standing ad posture advice comfortably set in your body is to focus in the middle of the step and not from foot to foot. This is why the 'walk' is so elusive to many... because it is not a walk like most persons think. The Argentines will dispute this, and say that you always have the weight over one foot or the other; never both. But, in the same breath, they will say, "When you move, take the weight with you so that it is neither leaning back on the standing foot nor lunging/landing prematurely on the stepping foot". You must understand the cultural and linguistic differences between the languages, and, quite frankly, the differences between teaching/learning styles of 2 different countries. Understand what they mean as they say it, not what they mean as you interpret it into your norm of understanding. The exercise is simple. Take a step forward; place the weight on both feet. Take another step, slowing and balancing as the feet/legs come together, then continue to the next step. Stop. You are focusing on middle to middle rather than foot to foot. This is the Argentine Walk. Master this after mastering the great posture concepts given by every and referenced above, and you will excel more quickly and easily. I promise.