Board Thread:Naruto Discussions/@comment-34049064-20180311033310/@comment-32617252-20180311050120

chakra comes from the shinju tree itself, the surrounding planet (aka nature energy: if u mix nature energy if with normal chakra, u get sage chakra, and if u mix all that with six paths chakra- the chakra that kaguya and her sons, hamura and hagoromo, have achieved by kaguya eating the shinju tree's fruit and passing down that chakra, in a diluted form, to her children, which had no nature energy in it btw since it was diluted, and they passed it down to other people, and now all characters have chakra in them), and basic chakra that is produced by normal people. the 8 gates are fully connected to the tenketsu (which are 8 tenketsu btw). if u release the fisrt tenketsu gate, u have achieved the 1st of the 8 gates. simple as that. and the nature transformation thingy- well, be more specific on what u wanna know about it.