I want to buy a dog,I have an apartment,he should be good with kids,he should be good in exercising,he should bark less,Should not be 2 big?

Stuffed dog from Walmart and/or Toys R Us. Not a Real Dog.

Dogs don't ready for your whims, they require a lot of patience, constant supervision, containment only when you can't immediate correction when caught in the act, consistency, diligence, daily exercise/elimination times, daily grooming is a must, all dogs bark your responsibility to control how much and when, training, socialization, and time, minimum 6-18 months, more or less, depending on the individual dog, if properly done, to start, on your part.

Once trained you must still enforce what was taught on the daily basis for the life of the dog, 12-17 years.

1. Is your apartment on the ground floor - if not, then buying a puppy isn't going to be easy. Puppies need to be taken out every hour during the waking day and once at night (and this may especially be a problem without a private enclosed area to use while the puppy isn't fully vaccinated).

2, Is somebody going to be home most of the time - puppies need to have somebody there pretty much all the time to begin with. Otherwise their crying, barking, howling is going to upset anybody within hearing distance

3. No puppy can be taken out for walks until he's fully vaccinated, and old enough

4. Your kids should be good with dogs - if they are under 5 it's unlikely they will understand a puppy isn't just another toy, and unintentionally make his life a misery.

5. Ideally any dog and especially a puppy (re vaccination) should have access to an outside area which is private and fenced.

It is possible to have a dog in an apartment situation as above, but it's not ideal so I'd wait until you do have a house with a garden before buying a dog.

What are you asking - and why because 2 days ago you were getting a Labrador Retriever which ISN'T a good breed for an apartment.

A dog should not ever be allowed out off lead until they have covered the basics. Collars etc are only props that are not needed if you do the basic obedience training, and should never replace basic training.

Read here https://tr.im/MXChN

There is no better way than enrolling at a good dog school where people can show you just how its done, especially if you are first time dog owner, its way better than trying to teach by yourself and getting it wrong. (its like trying to learn kung fu or yoga out of a book - you cant be sure you are doing it properly without help from a mentor who can demonstrate the correct techniques for best effect) Then you have to be consistent and practice every day. Your dog risks being hit by a car, casing accident etc and simply should not be let out like that until you have trained it properly. The dog needs to learn using a set system so it understands what you want. Dogs do not understand english (or any other human language). Its not really fair on the dog if you dont put the time in. And training using positive reinforcement is better than those collars which work on negative reinforcement / fear. Collars should only be used under expert advice where all regular training methods have failed. Oh, and dog should be behind fence and closed gates.

Also you will really enjoy dog classes and will find you form a strong bond of friendship with your dog as the lessons progress, and your dog learns to look to you for instruction, which is a lovely feeling of accomplishment!) Good luck. (PS a good reason to go to class not train at home, apart from this being your first time doing it, is that way you and dog learn around other dogs / distractions, whereas if you train at home you still have to teach dog to obey you in public where dog might act differently. At dog class you do exercises meeting and greeting other dogs, weaving around them, etc that you cannot do by yourself at home, and that makes your dog great in any situation.)

But I saw in Internet lab are good in apartment I was also thinking about pomerion ,golden retriever ,boxer, St Brenard, beagle

a Pug would be nice, a Schnauzer but they tend to be noisy.