Every Cultivation Techniques has skills that will unlock after reaching a certain skill level with the skill
Mastering Level of Cultivation Techniques is divided in
No Success -->Small Success --> Great Success --> Perfect Success
When skill reach new checkpoint of Cultivation Techniques, depending on the technique, you can get a new New Skills and Permanent Potion Effects.
If you are a op level 2 you can use /skills add <name_of_skill>