About your training
Originally, the Force powers were divided into three categories: Control, Sense, and Alter (or various combinations of the three).
But as time passed and Jedi relearned more about their abilities, it was realized that every student was different and were not always capable of performing every class of powers. The categories were hence refined into more select Disciplines. Within each discipline are major powers, called Proficiencies, and minor powers, called Skills. Not every Jedi will be able to perform every skill.
Disciplines - Jedi must choose a beginning
discipline for their area of expertise.
Proficiencies - proficiencies become added as a Jedi goes up in rank.
Skills - what all Jedi will learn to varying degrees
More will be added to this as time goes on.