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Imagine reading this as a headline in a learner's text book on a shooting range:

How to aim right

How to aim correctly

How to aim well

Basically, I want to say "how to aim to hit the target" in this passive manner and I'm trying to find the proper adjective to use for this. Any suggestions?

Aim right is a little ambiguous. It could mean to aim in the appropriate manner, to aim so as to hit the target, or to adjust your aim to the right.

Aim correctly would, to me, mean to aim in the correct manner - to do so in the way you are taught to aim.

Aim well would, to me, mean to take your time to aim, not rush. Unless it were "how to aim well", in which case it would mean instructions on how to aim effectively or correctly.

Aim accurately would be to aim in a way that means you hit the target.

Aim properly would capture several of these, not rushing, doing it in the correct manner, and that doing so would tend to allow you to hit the target.

Actually, no qualifier is needed. The expression:

How to aim a [pistol/rifle/weapon/etc]

is perfectly natural (example). By default, when you instruct someone how to do something, it's assumed you are telling them how to do it correctly.

However, if you want to emphasize that there is a correct method and and an incorrect method you could say something like:

How to correctly aim [a weapon].

As SamBC mentions, you can substitute various synonyms for "correctly": properly, accurately, appropriately, effectively, etc. You can also suggest you're teaching a particular technique: quickly, smoothly, steadily, etc. Example:

How to safely and accurately aim and fire a fully automatic weapon.

Also, by default, when you "aim" a weapon it's assumed to be at some target. Otherwise you're not really aiming it, but rather just pointing it in some vague direction.

As an alternative, you can use the idiomatic expression "take aim", which is commonly associated with the action of aiming a weapon, rather than some metaphorical aim.

How to correctly take aim at your target (when firing a semiautomatic rifle).

Idiomatically, the phrase to aim true might work. "True" here is in the sense of "straight, accurate, and without deviation", rather than the more common sense of "a statement agreeing with the facts". As an example, we have the headline How to Aim True at the F-class World Championships.