First Position
First Position is probably the first and most basic position you would learn in ballet. In First Position the back of your heals touch on the seam of your ballet shoes, while your feet are turned out as far as the knees. Your legs must be rottated outward as far as your body is able, while keeping pulled up throughout the body.
Second Position
In Second Position your heels should only be as wide as your hips, keeping the same turn-out and rottation as in First Position. Because second position is used in many center exersises, you must learn how to place Second Position correctly when you first start ballet.
Third Position
Third Position is'nt offen used by professionals. Third position is actualy a position to prepare you for Fifth. Usualy when you first start ballet your legs and feet are'nt able to handle Fifth Position, which may cause damage in your knees. We would'nt want THAT to happen! So I think it's a wonderful idea to learn Third position before fifth.
Fourth Ouverte
Fourth Ouverte you probably don't hear about as much as the others, but it is a position. In Fourth Ouverte (open) you start in First, then slide one foot ahead about the length of your foot, always keeping the same turn-out.
Fourth Croise'
In Fourth Croise' you would place one foot infont of the other at the length of your foot, just like in Fourth Ouverte, but the feet are placed so that if you had another pair of feet your size placed on the sides it would form a perfect box shape.
Fifth Position
Before I started ballet, if I emagined a ballerina, I emagined her standing in fifth position. Probably because Fifth is used alot in ballet. In Fifth Position your feet are almost placed like Fourth Croise' but your feet are touching each-other