Black magic has traditionally referred to the use of supernatural powers for evil and selfish purposes. In modern times, some find that the definition of "" has been convoluted by people who define practices that they disapprove of as "black magic
Within common mainstream religion, such as Christianity and The Old Religion of Paganism to an extent, there are certain taboos surrounding forms of magic. Although culture may place certain forms of magic in one side or another of this spectrum, there are in fact some cultural universals about free will.
True name spells - the theory that knowing a person's true name allows control over that person, making this wrong for the same reason. This can also be used as a connection to the other person, or to free them from another's compulsion, so it is in the grey area.
Immortality - from a Taoist perspective, life is finite, and wishing to live beyond one's natural span is not with the flow of nature. Beyond this, there is a major issue with immortality. Because of the need to test the results, the subjects must be killed. Even a spell to extend life may not be entirely good, especially if it draws life energy from another to sustain the spell.
Necromancy - for purposes of usage, this is defined not as general , but as any magic having to do with death itself, either through divination of entrails, or the act of raising the dead body, as opposed to resurrection or CPR.
Curses/Hexes - a curse can be as simple as wishing something bad would happen to another, to a complex ritual.