You learn one psionic discipline and one talent, of your choice.

• You have 1 Psionic point(psi) per level and which you recover after a long rest.
• Psionic Ability Intelligence is your psionic ability for your psionic disciplines. You use your Intelligence modifier when setting the saving throw DC for a psionic discipline or when making an attack roll with one. Discipline save DC = 8 + your proficiency bonus + your Intelligence modifier Discipline attack modifier = your proficiency bonus + your Intelligence modifier.
• Psionic Talents A psionic talent is a minor psionic effect you have mastered. Talents take no points to use.
• Psionic Disciplines A psionic discipline is a rigid set of mental exercises that allows a you to manifest psionic power. 
• Psychic Focus You can focus psionic energy on your psionic discipline to draw ongoing benefits from it. As a bonus action, you can choose  your psionic discipline and gain its psychic focus benefit, which is detailed in that discipline’s description. The benefit lasts until you are incapacitated or until you use another bonus action to choose a different focus benefit. You can have only one psychic focus benefit at a time, and using the psychic focus of one discipline doesn’t limit your ability to use other disciplines.
• Psi Limit There is a limit on the number of psi points you can spend to activate a psionic discipline. You can spend no more than 7 psi points on a discipline each time you use it, no matter how many psi points you have.