The Four Fard (Obligatory) Pillars of Wudu
Without these core acts, ablution is invalid according to consensus (Ijma')From the top of the forehead where normal hairline begins down to the bottom of the chin, and horizontally from earlobe to earlobe. Water must touch all visible facial skin and light facial hair.
Washing both hands, forearms, and elbows thoroughly. The elbows must be completely covered with water, starting from the fingertips right up past the joint.
Passing wet hands over the head. While the Hanbali and Maliki schools obligate wiping the entire head, the Shafi'i school accepts wiping a portion of the head, and the Hanafi school requires at least one-quarter.
Washing both feet thoroughly, including the heels, soles, and the two protruding ankle bones (Ka'bayn). Ensuring water reaches between all toes.