Whoa
The "whoa" command is the most important command for a bird dog to learn.Whoa simply means "stop, don't move your feet until you are told". It is an obedience command every bit as much as here or heel. It has many uses, from it's obvious use on birds in the field to extend the natural point, to just being able to put the dog somewhere and have it stay put while we take care of something else for a moment,to possibly saving the dog's life in traffic or other hazardous situation.
Here
The "here" command is equally important as the "whoa" command. If a dog learns any two things in their life it should be to stop on command and to come when called. This command can also be called the "come" command but "HERE" is a little easier to put emphasis on I think.
Heel/Sit
These two commands are similiar as that they both require a slightly increased level of training and require a dog to actually learn as opposed to relying on instincts. The "Heel" command requires a dog to walk or stand aside from his owner. As to which side is owner preference, certain social rings believe it should always be on the right side. I'm perfectly happy if my pup walks along either side of me, just so long as they are with in arms reach.
The "Sit" command also encompasses the "Stay" Comand. If a dog is sitting; it's staying point blank. This command is used frequently in the field when utilizing your dog for retrieving puposes like duck or dove hunting. Additionally when you are introducing your dog to new people or asking your dog to stay put while set up training.
Fetch/Working close
Like the "Heel/Sit" commands; these two commands require an even higher level of training. The "Fetch" command is exactly what it sounds like. You are asking a dog to retrieve an object or item for you and willinging give it to you. Most dogs will out of a genuine desire to please, want to bring you an item that you throw or that you are playing with. but to get a dog to do it everytime, all the time; the dog should be force trained to retrieve. This is not as bad as it actually sounds or amazingly difficult. the training involves actually showing a pup what you are asking or it to do and then through repetition ingraining that task in them.
The "Work Close" command is used for when we want our dog to work closer to us than they are usually comfortable. Most average dogs will work between 30-70 yards in front of us and quartering left and right, maybe 50-80 yards. The "work close" command should cut that distance in half or more. The reason this command would/could be used is if you are in an area with lots of vegitation/heavily wooded or if you as the "human" know there are birds in the area and the dog is just moving a little fast or not directly in the wind where they can find them.