Basic Firebending
Fire is the element of power. The fire generates spontaneously with energy drawn from inside the firebender and the will to accomplish something. When the Lion Turtles left, the dragons were the inspiration for the future firebenders, who became the Sun Warrior civilization, and later the Fire Nation. Fire is notable for being the only element that isn't from an external source, and with a general lack of defense against attacks.
Like all the other elements, firebending possesses no real edge over the other three unless in special circumstances. Firebenders enjoy sunlight and warmth, and would benefit from a clear goal in mind. For a while, the people of the Fire Nation used hate to fuel their fire. After Zuko and Aang visited the Sun Warriors, they learned from the only two remaining dragons alive that this wasn't necessary. The dragons showed them many more colors of fire; in unrelated news, Zuko's sister Azula is the only person we know of that generates blue fire. It is apparently hotter, but we don't know why she has it. The firebenders use this fuel to go on the offensive during fights, using quick attacks that would usually leave the opponent overwhelmed. If the opponent is good, however, the firebender will have to be on their guard. Cold environments at night are never good for a firebender (cough cough zuko cough both times cough zuko north pole cough cough).
Firebenders all seem to share one style, some just have more advanced moves than others. The Fire Nation is the most well-organized and technologically advanced country, after all, so this isn't much of a surprise. Like water and earth, firebending has been revolutionized through sports like pro-bending.
