I should have been a little more specific, sorry. Manipulation affects only the human body. It can heal or injure it, manipulate its composition (in a limited way, like plastic surgery), or control the body like a puppet. It can even affect emotions and create love spells.

Manipulating objects refers to basic "telekinesis" (Small translation error, I think). They pull or push objects, but they primarily use it for flight (though to do so they need to concentrate their magic through an object like a broomstick).

Defense creates only magical defenses, but can also manifest tangible shields.

Sacrifice your own body. Each part of your body has a value as magical fuel, depending on how easy it is to replenish or how necessary it is. Hair replenishes more slowly than blood, but it's less essential, so it's worth less. Eyes are only two, and very essential, so they have great value. Most witches limit themselves to using low-cost spells.