Short answers, pulled from the story.
Horus is one of the most significant deities in ancient Egyptian religion, serving as the god of kingship, healing, protection, the sun, and the sky. He was most often depicted as a falcon or as a man with a falcon head. Worship of Horus extended from at least the late prehistoric period through the Ptolemaic Kingdom and Roman Egypt.
The Eye of Horus, known in Egyptian as the wedjat, is an ancient symbol of protection and royal power. It originated as the all-seeing eye of the early deity Wadjet and was later associated with Horus. Funerary amulets in this shape were placed on mummies, and sailors painted the symbol on the bows of ships to ensure safe sea travel.
The myth, recorded in The Contendings of Horus and Seth, describes a conflict over who would rule Egypt following the murder of Osiris by Set. After more than eighty years of battles and contests, including a boat race in which Set's stone vessel sank while Horus sailed a wooden boat painted to resemble stone, Set formally surrendered the throne to Horus.
The Festival of Victory, called Heb Nekhtet in Egyptian, was an annual festival held at the Temple of Horus at Edfu during the second month of the Season of the Emergence. The king of Egypt played the role of Horus and struck a hippopotamus representing Set with a harpoon, re-enacting Horus's mythological triumph and legitimizing royal authority.
Every living pharaoh was considered a manifestation of Horus, and upon death became identified with Osiris. The Pyramid Texts, dated to around 2400-2300 BCE, describe this dual nature explicitly. Rulers of the early unified kingdom called themselves "followers of Horus", establishing the falcon deity as the theological foundation of royal power.
Egyptologists recognize multiple distinct forms of Horus, including Heru-ur (Horus the Elder), worshipped at Letopolis and identified by the Greeks with Apollo; Heru-pa-khered (Harpocrates), the child form first depicted on a stele from Mendes during the reign of Sheshonq III; Har-em-akhet, associated with the Great Sphinx of Giza; and Harpara, the solar child of Montu and Raet-Tawy worshipped at Armant and Medamud.