Well, there aren't really correct and incorrect ways. Of course, you don't want to pick up your tiel by the neck. Most cockatiels will stand on your finger, or your shoulder. You don't really hold a cockatiel. It's more like they are walking or standing on you. Most of the time-they will step up on your finger, and sometimes they will use your arm as a bridge to make their way up to your shoulder. If they nip you sometimes, they are not intentionally biting you.
They are simply using their beak as a third hand, to grab onto you to help get themselves up.
I would recommend you buy a baby cockatiel. That way it would be more likely to bond with you.
If you hold on tight.
The proper way to hold an American Flag is over the shoulder or in the air, but not touching the ground.
the proper way to hold a fork
What? I'm not sure anybody can even understand what you're trying to say. Try putting proper grammar and such into your question, and maybe then we won't be really confused.
Cockatiel's are very difficult to age. You can only be accurate about their age if you've had the bird from a baby. The only way a cockatiel can be aged is as a juvenile, adult or senior.
Cockatiels are wild birds so if they were never tamed when they were young, they will still be untame. It is easier to tame a young cockatiel, however with the right attitude, you can tame an adult cockatiel. You have to start with trust. Taming a cockatiel take a while and one wrong move could ruin all your work. Start with standing next to the cage and talking to your bird. Do this for about a week so your cockatiel gets to know your voice and is calmer around you. Then you could try putting a fresh vegetable (in your hand) next to the cockatiel and hold it there. Don't force the cockatiel to get closer to your hand - this will scare him/her. You need to earn trust. Eventually, your cockatiel will be comfortable with you having your hand near him/her. If you cockatiel is comfortable to actually eat from your hand, you can try picking it up. Do not grab our cockatiel on its back, try to persuade him/her to sit on your finger. Do not force your cockatiel to get onto your hand. This will ruin the trust. Eventually your cockatiel will be ready to sit on your finger and eventually your shoulder! It's all about trust and if you're cockatiel trusts you, it would love to sit on your shoulder!
The cockatiel is a type of Australian parrot.
you hold the neck with one hand and the base with the other hand. you should never hold the arms or else it will break.
Cockatiel females are fertilized internally.
It's not a problem, in a way it's a good thing because, while a dog may eat a cockatiel if it becomes angry with it, a cockatiel definatly won't eat a dog!
No way. They are both different species, and completely different sizes.