Dragon Training is when young Vikings learned how to slay dragons before the end of the Dragon War. (How to Train Your Dragon) During their training, they will learn how to use a shield and know each type of dragon's weaknesses. At the end of their training, the Viking Elder will pick the most promising fighter and make him/her fight against a Monstrous Nightmare. If the child wins, he/she will become a full Viking.
In the story, Hiccup is eventually chosen to fight against a Monstrous Nightmare using tactics not taught by Gobber the Belch, yet learned from spending time with Toothless.
Spears (with or without spear heads)
Battle axes (single and double edged)
Trebuchets (ignited or non-ignited projectiles)
Bow/Longbow (component of Hiccup's bola sling)
Spears (without spear heads)
Lessons taught by Gobber
Every dragon has a limited number of shots.
Every dragon has a blind spot (proved not true).
A dragon can't light its fire if their head is wet.
The most important weapon is the shield.
The shield can be used to throw off a dragon's aim by making noise.
A downed dragon is a dead dragon.
A dragon will always, always go for the kill (proved not true).
You know when it's about to breathe fire when you hear a little hissing sound.
Strategies used in Training a Dragon (or defending yourself without harming it) and Dragon Quirks/Weaknesses
Render yourself defenseless in order to earn their trust (best way to train Night Furies).
Give powerful dragons (such as Monstrous Nightmares and Thunderdrums) the respect that is their due. Place a gentle hand on their snout.
Get their attention (usually with food).
All dragons will collapse when scratched in a point by the neck (mainly the chin). Though Gronckles don't like being scratched on the chin.
All dragons (with the exception of Whispering Deaths) love the scent of dragon nip.
Terrible Terrors can get distracted by a concentrated point of light (so too, can Night Furies).
All dragons (except the Typhoomerang) have an aversion to eel.
We don't have to fight them.
When attempting to train a Gronckle, be aware that there are two ways of befriending them. The first way is since Gronckles love to eat sandstone, feeding it sandstone, or some other kind of rock, they will accept you. The second way is to give them lots and lots of love and affection which due to their sweet nature, they love.
Whispering Deaths love having their teeth brushed.
Approach a Deadly Nadder from behind, make sure that it can see you. If you prove you're not a threat, it will let you smooth it's tail spikes down.
A Timberjack will be your faithful companion if you scratch an itch on it's back (which due to it's enormous wings, it cannot reach on it's own).
Scauldrons are sentimental dragons. Dump a bucket of water on yourself, and they will playfull lick it off, as it reminds them of home. Or you could either put fish oil in your hair or on your clothes. Or you could roll in a pile of fresh fish.
When feeding a multi-headed dragon, such as a Hideous Zippleback or Snaptrapper, feed all the heads at once.
Feeding all the heads at once, then playing with all the heads at once, is the best way to train a Hideous Zippleback.
Snaptrappers love rain, because they enjoy playing in the resulting mud.
Give a Boneknapper the bone it's looking for, and it will become very affectionate towards you.
Changewings display mimicking behavior; whatever they see, they love to imitate. Night Furies may also mimic you.
Fireworms are (quite ironically) afraid of fire.
Dragons do not have fireproof innards (as seen with the Red Death and Terrible Terrors).
Night Furies may regurgitate part of a fish that you feed them, which they expect you to eat, it is wise to obey it's request.
Monstrous Nightmares like having their head or more accurately, their horns, pinned on the ground.
Terrible Terrors can be befriended by giving them a fish to eat.
Screaming Death are attracted to sun light when young.
Deadly Nadders love to eat chicken, so it is a good idea to bring some chicken with you when you are trying to train it.
You know you have formed a bond, when the dragon touches its snout to your hand.
Expert trainers also recognize that the best way to train their dragons is to adopt a “work hard, play hard” attitude. After a long day of training, remember to have some fun with your scaly friend by playing a friendly game of catch, using the mirror to make them chase after a dot of sunlight, or fry some eels. This time dedicated to fun and relaxation will ensure that your dragon doesn’t burn out too quickly.