For a while, I tried to figure how to master The Avatar State works. Did all the Avatars before Aang open their chakras? Is there more than one method? When it came to the chakras, I feel that in all they had to give up their Earthly attachments and basically get it back to master it. Learning all the elements helps build their will and help them understand all the matters of life through each nation. And when it came to the Avatar State, when they're ready, they lose themselves in the Avatar State and it's their will to find themselves and overpower it. there's so much to write about this topice but that's the general idea.