The left shoulder is usually formed at the end of an extensive move during which is noticeably high. Once the high of the left shoulder is formed, there is a subsequent reaction and prices slide down to a level which generally occurs on low . The prices then will rally up to form the head with normal or heavy and subsequent reaction downward is accompanied with lesser . The right shoulder is formed when prices move up again but remain below the central peak called the Head and can fall down nearly equal to the first valley between the left shoulder and the head . is usually smaller with the right shoulder formation compared to the left shoulder and the head formation, from here with the right shoulder being denied, when retesting the last high, we generally have a large fall. This fall tends to be the distance from the high of the head to the neckline. This does not always happen, if comes back in from larger bids it can stop the slide. This seems to be more prevalent in Crypto too. The opposite is said to be true for inverse head and shoulder formations. Also if the head is lower than the shoulders, this is generally referred to as a triple top or bottom, it good to remember if you see a triple form and a rally to a fourth top is underway, it usually is a sign that it will continue to a new high or low.
Good luck and Happy Trading