This jutsu was created by Minato Namikaze, and quite possibly the reason behind his nickname, "Konoha's Yellow Flash" (木ノ葉の黄色い閃光 Konoha no Kīroi Senkō). It allows the user to move himself to another location in the blink of an eye. Although it is often compared with the Body Flicker Technique, the speed of this jutsu is much greater. In principle, this jutsu is similar to the Reverse Summoning Technique, as it revolves around manipulation of time and space rather than accelerated movement, but instead of bringing something to users, it sends them somewhere. Additionally, it makes no noise and produces no puff of smoke, allowing the user to appear behind someone unnoticed.
To activate this jutsu, the user needs a special seal or "jutsu formula" (術式, jutsu-shiki) to mark the destination. After this is done, the user enters a dimensional void that almost instantaneously transport himself to the location of the seal. Minato applied the formula in advance to weapons such as kunai. By giving one such kunai to a person, he can immediately teleport to that person at any time. He can also apply the mark to a touched area, such as his opponent or some other surrounding feature.
Furthermore, if an object marked with the seal may touch the ground, Minato will immediately know the position of everyone close to the object. This technique also possesses surveillance purposes as he can continuously sense where anyone is as long as the seal is on them. No matter where an opponent is, he arrived directly next to them. The jutsu is also very unique because it requires no use of chakra, due to a special secondary seal that emits the same chakra as him, allowing him to have an instant connection to the area.
There is all to the FTG, this thread maker didint notice that FTG doesn't consume any chakra. But it does require a seal OR a FORMULA to activate the teleportation. If someone dont know what formula is, go google it
Theres been many people saying that FTG is insta death but it isnt true. Example minato could touch a plastic C4 clone that Deidara uses and then minato uses FTG and goes into a trap and kaboom hes confused
Anyway Minato is dead so we never know how strong he was