Cursed Techniques ( Jutsushiki?) are abilities that consumes curse power. There are different type of techniques that you can obtain through a book that is given when you spawn in a new world. There are currently 39 cursed techniques in-game.
Cursed Techniques are also used by various mobs and can be stronger than your Cursed Technique due to the mob's buff. Factors that affects these are various special effects which buffs the mob. To unlock the moves of your technique you're gonna need to level your Sorcerer Grade. However, some Cursed Techniques can be very unique than the others and gives you all the moves at once (i.e Ten Shadows)
(Note: Every Technique has the three default physical attacks: Attack, Knockback Attack, and Barrage Attack.)
Curse Power
Curse Power is the thing you need in order to power your cursed techniques. In order to increase your Curse Power you need to level up your sorcerer level by killing various Jujutsu Craft's mob. There are currently 7 grades in the game consisting of Grade 4, Grade 3, Semi Grade 2, Grade 2, Semi Grade 1, Grade 1, and the Special Grade which is the highest sorcerer level.
The amount of Curse Power you get also depends on what Cursed Technique you currently have. For example, you can be a special grade and have Toji/Maki's Heavenly Restriction, you'll have 0 cursed power but if you have Yuta Okkotsu's Cursed Technique then you'll have 8000 curse power.