The Simple Summary of Technique.

For a dancer to be capeable to try ballet they need some or all of a few things:

-Perfection in their movements

-Natural Musical Rythum

-Natural Flexibility

-Born with good turnout, feet arches, loose and bendy backs

-Dance Quality

-Good posture

-Confidence in performance

-Want to be Healthy, Fit and Strong

These are just a few things that most dancers need to grow at ballet.
All dancers have their problem in their body/performance technique and ballet is just one type of athletic excersise that you always can be better and work harder.

One of the main points in Ballet technique is turnout.
Turnout is how the foot turn at the hip away from the body.
It is how a dancer keeps their balance when moving so quickly.
It starts from the inside of the top of the thigh where you rotate the muscles outward. You then, using the inner thigh muscles, rotate the knee and the foot as far as they will 'turnout' naturally.
Flat turnout is the best turnout anyone can have and it is quite rare. It is when the foot is at 180 degrees to the legs.