Coming off raw knowledge.
Ninjutsu is one of 3 forms of shinobi tactics. With numerous sub categories from purely chairs based to elemental based and further.
Rasengan is a form of raw ninjutsu
So is the clone technique
Well it is also utilized as raw chakra or for elemental, forbidden and sealing jutsus as well. Its basically the use of raw chakra manipulated by chakra moulding into mainly supplementary use.
Raw chakra output can be altered with the use of hand seals and chakra manipulation.
Elemental Ninjutsu over power non elemental ninjutsu.
Shadow clones is a prime example of ninjutsu. So is wall tree and water walking.
Chakra is stored and utilized withing our stomachs and released through all 361 chakra points in our body allowing us to freely utilize chakra in a form known as Ninjutsu.
Unlike taijutsu which uses know chakra
and genjutsu which manipulates anothers chakra.
Noticing a nearby squirrel. He throws a kunai high directly above him before he begins to focus on the squirrel.
As he focuses....nothing happens. The kunai reaches its peak before rotating 180 and falling back down towards Benn.
Still focusing, the squirrel eats his snack , non phased almost mocking Benn.
"Cmoooon." He thinks as the kunai reaches the half way point of the fall to earth.
The squirrel pauses. His eyes widen as he stands there mid bite. Benn continuing to focus when he remembers.
The squirrel runs off as Benn quickly leaps back. His hand getting cut in the process due to not being quick enough.
Bandaging it up he looks at house and asks..."Sensei did you see the squirrel?"