It was best said by Hashirama that the core of what a shinobi is, is someone who endures. Of course it could be said of anyone but shonobi work under the most extreme of circumstances as compared to the normal life of a person. As children, we are taught to survive, cast away our emotions, and follow orders. It would be easy to just say that shinobi are those who are able to utilize chakra and perform tasks that couldn't normally be done but that would be a disservice to the many who gave their lives in the battlefield and those who worked hard to improve their way of life. We are not heroes or gods, we are merely humans fighting to exist in a world that only knows hate and despair. Our goal in the end, is to work towards peace and stability, to which some would go to great lengths to preserve.
Now onto what chakra is. I couldn't tell you the scientific side of it as it is not known to me. The only thing I can tell you is that it is the actualization of matter created from our physical and mental/spiritual energy. With it we are able to perform tasks that couldn't normally be done with one's own effort alone. Taijutsu relies more on our physical energy though in small portions, draws on our mental energy. Genjutsu relies more on our mental energy and in the same way as taijutsu, draws a portion of our physical energy. I would say that Ninjutsu is a balance of both mental and spiritual energies though I would have to say that it varies on what it is. Each one has its own requirements and rules and that goes for everything. Chakra isn't an unlimited source (although we would wish it were). Each person carries a set amount that grows from childhood to adulthood, though after that it stays the same. There are many theories as to what increases your chakra such as a strong life force like the Uzumaki but that is just speculation. In order to replenish one's lost chakra you either rest and recover or through the use of a chakra transfer technique though it requires a near perfect control of one's chakra. I would say Jinchuuriki have an almost limitless supply of chakra but normally the Bijuu are not apt to help their hosts and instead can hinder them so I will forego the details of it all.
Since I explained what chakra is then I can shorten this one a bit. Ninjutsu or Ninja Techniques, are techniques fueled by chakra, that allow you to perform tasks that cannot be normally done. By transferring my chakra to a blade on the ground, I could cause it to levitate and fly towards you, aiming at your heart and kill you. Of course, I don't think you would die so easily as most shinobi are taught to counter such petty things. However, a user with skill can do that much and more given the opportunity. The more stronger and difficult the technique, the more chakra is expended to fuel it. If you wanted to, you could separate ninjutsu into two categories, those that can be done instantaneously or near-instantaneous and those that require you to fuel and maintain it. Out of all ninjutsu, the more widely used techniques are those that draw on the elemental nature of either wind, water, earth, fire, and lightning. Each one has its own properties and limitations such as their strengths/weakness in relation to another. In essence, all techniques fueled by chakra work by two conditions: Nature and Shape Transformation. The higher the level of the technique the more higher those two properties are, the higher the rank and dangerous the technique.
There's not much to say about my training as I don't think I could write down everything for you. However I will endulge you by mentioning people who helped shape how I roleplay and train:
LonelyAssassin - First person to roleplay in my training. I actually looked forward to our training sessions. Sad he lost his senpaiship and can't be a sensei.
Adachi/Souji - Very good at integrating Roleplay in their training and something I wish to emulate one day.
Scorps - Meeting someone with an extensive knowledge of jutsu has motivated me to look more closely at how they work. He also taught me that hard work pays off in the end.
Jacob Moore - First person to ever ask me what I thought about fire and my goals in life instead of jumping into mindless jutsu training.
Zenryoku - Before he left, our conversation about the rp enlightened me that there is more to what is perceived. If one works hard and is steadfast in their goals, you can achieve anything.
Edward - That guy blazed through training and left me in the dust man. T__T It motivates me to keep working hard to one day fight him toe to toe.
but all those people couldn't even come close to the primary source of my motivation/inspiration. Don't get too excited senpai...
Dragy - It was quite interesting that I started out motivating him but instead he grew so fast that now he is the one teaching me. Not only is he better at writing than I am, but he also has vast understanding of jutsu that will eventually surpass even Scorps'. If you combined me and him into one being, we would be the equivalent if you merged all the RP Mods into one. xD
But enough of the ego boost. >_>
Over the years I have had many goals. To be a senpai, a sensei, a member of the Akatsuki, a jinchuuriki, a RP mod, a regular mod, a Kage, a nb medical student. But as time went on I have slowly lost my motivation to do any of those because I simply lack the qualities or knowledge to be one. Instead the only thing I know I can do is help people as best I can and work hard to improve the community in my own way, under the radar. I don't think I merit any reward or acknowledgement as their are others who can simply do it better and faster than me. So for now, I am just me, Deviation. I don't want to be overpowered with a vast array of jutsu at my disposal, I just want to be simple, kind, and logical.