Hello sensei! This is my first time training in general, so forgive me if I take a bit to reply myself
A Ninja is one who sticks to the shadow to achieve their goals. Ninja specialize in unorthodox warefare, taking their missions as far as such things as assassination, sabotage, theft, etc. They are highly skilled individuals who are able to complete these tasks with ease and sleight of hand. They stick to the shadow to defend the light.
Chakra is a basic essential for all life, and can even be represented as one's life force itself. Chakra is created by the molding of one's physical and spiritual energy, and flows throughout the body. Chakra is necessary for many different jutsu that Shinobi utilize, and can help tremendously in almost any situation, given the necessary control and strength.
Ninjutsu is the Shinobi art of utilizing chakra to create different effects on themselves, an opponent, or the environment. Most Ninjutsu require a string of handseals along with the release of chakra to use, but there are a few that do not require so much effort. With enough experience, a shinobi may not even need to perform handseals for certain ninjutsu.
The Elements in the Shinobi world are represented by our most basic elements in everyday life. Fire (火遁), Water (水遁), Wind (風遁), Earth (土遁), and Lightning (雷遁) are the basic elements that a shinobi may use, and the more advanced elements require mixing of these five main elements to be created.
Elemental Ninjutsu is the art of molding and shaping one's chakra to create one of the above elements. Nature Transformation plays a big role in this, allowing Shinobi to use different elements and not just a singular element. However, everyone is born with a certain Nature Affinity, and depending on this affinity allows them to use that range of Nature Transformation more easily.
Was that satisfactory, sensei?