My Main Question:
What Exactly Is Energybending And How many spirits Do You Need To Do It?
One of the greatest bending abilities is energy bending. It was introduced at the very last minute of the third act in the series. Given the fact, They never really explained how to unlock the ability to Energybend. Nor the number of spirits required for it. It was only used as a plot device that ultimately prevents Aang from having to kill Fire Lord Ozai.
I'm questioning how Aang initially discovered energy bending, and how long it took him to fully master it. Energybending is capable of removing and restoring the user‘s bending ability as demonstrated by Aang. Because Energybending predates the other elementals, users can bend the life energy within them, which can seal or restore bending.