How is Armament Haki obtained or learned?

Question

Armament Haki is being used by a number of users, namely Luffy, Sabo, Garp, Chinjao, etc.

So, has there been any explanation given about the process or training involved in obtaining this Haki ?

Answer 1

As an introduction I will quote the wiki page on Haki:

Haki is a mysterious power that is found in every living being in the world. It is not that different from the normal senses. However, most people do not notice it or fail to awaken it. Broadly, there are two types of Haki common to everyone, given the proper training

As mentioned here, everybody has the ability to learn Haki, given the proper training. We have seen lots of examples of people who had obtained Haki through training, like the girls from the Kuja tribe, Luffy during his training with Rayleigh, Cobi during his training with Garp, etc. Almost every person we have seen, that uses Haki has gone through some kind of training from a Haki expert. The problem is that none of these training sessions have been shown as of writing.

Training is not the only way to obtain Haki though. As mentioned in the introduction, Haki is not different from your normal senses and that means that you can also obtain Haki subconsciously. We have seen a handful of cases, where people had obtained Haki on their own, without any training whatsoever. Examples of this are Ace and Luffy obtaining Conqueror's Haki, Cobi and Usopp obtaining Observation Haki or Sai obtaining Armament Haki. So it does not mean you have to take training per se to obtain Haki, but it is well advised to take training to fully control your power. Ace for example was shown to have Conqueror's Haki, but it did not look like he ever learned how to control it properly.

Answer 2

I think to obtain certain haki, you have to do special training or learn some kind of technique, for armament haki you would have to boost your strength and fighting spirit to concentrate enough power to learn armament haki. For observation haki, i think you would have to learn to concentrate on listening, hearing, seeing and smelling. Or(For people who want to learn it the easy way)you could meditate and begin to be more at peace, so you would be able to not only see, but also hear your surrounding better, so it's harder for your opponent to hit you. To learn conquerers' haki...

I don't know, that's really never been cleared before. Well hope this info helps those who want to learn haki.

Answer 3

You have to be at a certain level of skill before you can learn haki. All the characters have shown usage of haki before they went into special training to get better at it. If you picked the weakest person off the street you would first train them in combat for at least one to two years before they start to show signs of being able to use haki. Ussop is a good example because he was very weak and grew to some extent from battling with the straw hats. Even then he wouldn’t have been able to get training for haki. It was only after two more years of training and a stressful situation did he finally use observation haki to save Luffy from Sugar.