Players must wear shinguards, covered with socks, to every training session and game.
Myth about shoes: "Players must wear soccer shoes." False. Any comfortable, safe shoes, such as running/athletic shoes, are acceptable. Not allowed are shoes with metal toe cleats.
Unless it's freezing, players should bring water to every training session and game.
Also see cold and hot weather safety.
Players under 18 are not allowed to move goals or be in the vicinity when goals are being moved.