The practice of witchcraft is both the lowest and the highest of magics, in that it is truly universal. Anyone can undertake it, and almost anything is possible with it. The only drawback is that doing anything with witchcraft is a bit of a ritual. Literally.

Witchcraft involves the long winded process of preparing a working space, preparing instruments and ingredients, performing actions, uttering words in both understandable, and long unfathomable tongues, in some cases making sacrifices, and eventually an effect outside of the 'normal realms of science' is caused.

Learning ritual magic is not easy. For one thing, finding a reliable and competent teacher can be difficult. Then there is the available source material from which to learn  - and finally there's that little stigma that a significant proportion of organised religions throughout existence will declare those who practice witchcraft as 'hellspawn followers of Satan' treat them accordingly.

Also - another drawback with witchcraft is that to get any really significant effects to happen takes bucket-loads of magical energy, and that only comes through having really elaborate long winded rituals involving whole bunches of participating people, that go on for ages, and have increasingly more opportunities for errors the more elaborate they get. Oddly enough, that doesn't stop people trying...