The foundation of reliable dog training is providing your dog with appropriate supervision and guidance.
 

Always plan ahead to guide your dog towards an appropriate behavior rather than allowing your dog the opportunity to make a bad choice.
 
Remember to always reward good behavior, even when the behavior is not the results of a command. Good behavior is good behavior and it should be encouraged.
 
Punishment is rarely a good choice for changing your dog's behavior. Preventing & redirecting unwanted behavior is much more effective.
 
Do not allow your dog the opportunity to practice unwanted behaviors.
 
Do not put your dog in situations where they will fail.
 

Use gradual steps to teach your dog how to behave in difficult situations.
 

Say what you mean and mean what you say. To create success, follow through with all commands and rules.
 
Remember that negative attention is still attention. Many dogs learn to misbehave when their owners  regularly react to their inappropriate behavior.  Plan to prevent rather than react to unwanted behavior.
 
Keep in mind that simply repeating a command is  NOT TEACHING the command.  Learn to guide your dog, starting in non distracting environments. Gradually increase the difficulty while maintaining successful behavior.
 
Many dogs need help to be properly socialized with people and other dogs. Provide positive learning experiences.
 
Teaching your dog simple easy to obey commands such as sitting before going through a door.  Will help your dog behave better
 
Practicing daily commands and rules will help your dog manage commands in more difficult situations.
 
Dogs learn many behaviors while they are playing.   Play with your dog in constructive ways.  Avoid tug-of-war and chase games.
 
Give commands ONCE, then guide your dog to the appropriate behavior.   Do not nag at your dogs by repeating commands, they will surely learn to ignore  you.
 
Overlaying commands on desired behaviors is an affective way of teaching commands.
 
Teach tolerance & reward calm behaviors to prevent possession aggression.
 
All aggression problems should be considered serious. The earlier the problems are addressed the better the outcomes will be.
 
In home counseling is recommended for behaviors such as aggression, separation anxiety, fear of thunder, housebreaking problems, destructive chewing, and  intra-family dog aggression.