Okay, i shall answer them. U_U
1- Technically, a ninja are skilled people who take jobs in order to learn money. Ninjas in naruto world use ninjutsu/taijutsu/kenjutsu/genjutsu/and elemental ninjutsu to perform techniques, which reflects the strength of said ninja. Ninjas come in ranks, Genin, Chuunin, Jounin, and Kage Level. Some ninjas are ranked as S-Jounins, specialized ninjas who truly excel in one skill. Ninjas battle in stealth and carry out their missions with nothing but success in their minds. They all work for one person, the kage, who is the strongest in one village and keeps the village protected and together. For others, like jiraiya, a ninja means those who endure even the toughest situation. ( i think that was jiraiya, maybe itatchi o.o )
2- Chakra is the basic of all basics. It is like fuel for ninjas and is required to perform most ninja techniques, especially elemental techniques. Chakra also reflects how much energy one ninja has left. If a ninja has high chakra reserves, it means they have more room to perform techniques that are stronger or techniques in general. People in the naruto world who has chakra are ninjas.
3- Okay basically, ninjutsu is ninja techniques. These are the basic techniques most ninjas are taught and does not include elemental ninjutsu. Genjutsu is illusion techniques, techniques where you inject chakra in your opponent's chakra and make them believe things that aren't actually happening. Taijutsu is hand to hand combat techniques, like martial arts.
4- Regular ninjutsu, idk i dont think it exist. Not sure what it is really, but elemental ninjutsu aren't regular for sure. People could create their own ninjutsu and improve other ninjutsus as well.
5- Fire, Water, Lightning, Earth, and Wind.
6- Water is one of the elements and it is.. water. lol. It is like real life water but the ninjas can use their chakra to manipulate the water and form techniques offensively and defensively.
7- Fire:
ohh okay ^^
Fire is one of the basic 5 elements (water, earth, fire, lightning, wind) It is performed by molding your fire-based chakra and making it as hot as possible inside one's stomach, and is released by either the lungs and mouth. Fire release can be used in weapons, like most elements, and is associated with explosives like explosive tags. Fire release can easily be described as extremely hot and in terms of damage, they tend to create combustive and explosive damages. This chakra nature is common among Konoha, more specifically, the Uchiha clan. Amaterausu is probably the highest level of fire, only known by Uchiha members with MS. Fire element is naturally weak against water because water extinguishes fire. Fire is strong against wind because the wind cause fire to become stronger and larger. Fire and lightning work well together to perform strong techniques, such as kirin. By heating up the clouds and creating the thundercloud with a strong katon technique, you can use an elite lightning technique called kirin that causes tremendous damage and is almost unavoidable. Kekkei genkai's with fire include scorch release, boil release, and lava release. Kekkei touta with fire is the only one, Dust release. Blaze release is another word for Amaterasu.
8- well i don't really know this one :/
9- Handseals give us an easier time to let chakra flow for certain techniques, however, handseals are not required in all techniques. They are commonly used on chakra-consuming techniques.
10- two elemental ninjutsus that fuse together in perfect harmony to create a new element. Though it is usually a bloodline limit
