Hand Seals are used to perform techniques such as Genjutsu, Ninjutsu, and some special Taijutsu. The amount of chakra necessary for manipulating chakra for a technique is also done through Hand Seals. A skilled ninja doesn’t need to perform many Hand Seals.
In rare cases, a ninja can perform One-Handed Seals!
Here’s a list of all 7 Shinobi who can perform one-handed seals.
7. Zabuza Momochi
Zabuza was a missing-nin from Kirigakure. He was also a member of the Seven Swordsmen of the Mist.
Zabuza was an exceptionally skilled Shinobi, especially when it came to assassination. Zabuza Momochi was also one of the few Ninja who could perform one handed seals.