Hoodoo is an African American Folk Magic with Native American plant knowledge. Hoodoo was thought to be brought to the Americas when slaves were shipped from Africa to America. The Slaves had no idea what these native plants and land were, some think that they communicated with the Native Americans to learn knowledge from them about the plants and herbs there.
Hoodoo is also known as Conjure, Rootwork, and Tricking. It has been practiced by both black and whites, even though the majority of practitioners are black. Hoodoo is often confused with Voodoo, even though Voodoo is a Haitian religion. Hoodoo emphasizes personal power of the practitioner, and does not have any priest or priestesses. It's usually passed down a family line, but can be learned from an individual teacher. Some Hoodoo beliefs include a Higher Power, Life after Death, Divination, and Justice.
Some practices of Hoodoo include foot track magic or crossing, and mojo or conjure bags. Foot track magic is when a practitioner lays down a wavy line or crisscross pattern, and whoever steps over that wishes to do harm feels the hurt in their legs since they've crossed over the marking.
Mojo bags, are popular little bags filled with charms, herbs, and other magical items that attract a certain result (Love, money, prosperity, etc). Some practitioners carry their mojo bags on them or place them in a safe location.
SOURCES: HOODOO, CONJURE, and ROOTWORK African American Folk Magic by Catherine Yronwode, Hoodoo in Theory and Practice by Catherine Yronwode.