Where was Achilless weak point?

Achilles' weak point was his heel, which was famously referred to as his "Achilles' heel." According to mythology, his mother, Thetis, dipped him in the River Styx to make him invulnerable, but she held him by his heel, leaving that part of his body exposed. This vulnerability ultimately led to his downfall, as he was killed by an arrow shot into his heel during the Trojan War.