What Is Five Ways to Stop a Dog's Barking Bad Behavior?

Depends on what's causing the barking.  Hiring a trainer can help further (you can ask your vet about different trainers they reccomend).

If it's out of boredom then the dog needs more interaction from you in the form more physical exercise and mental stimulation. 

If it's out of nuisance alert barking (at basically the sight and sound of anything around it) then you need to remove the dogs access to that stimulation when you're away and can't correct it. If they're outdoors, bring them inside and gate them away from the front room of the house so they don't have access to windows looking out to the street.

If it's out of loneliness then you as the owner need to either consider either working from home, coming home at your break times to spend time with them, taking them to work with you if possible, hiring a dog walker to come by your home once or twice depending on how long you're away, using a day pet sitter or a family member/friend who you trust and is also home, using a doggy daycare, or thinking long and hard about what's best for the dog and think about surrendering them to a no-kill shelter/rescue or finding them a new home.

1) Contact a private dog trainer and ask for help and let them see, what triggers the barking in your: home, yard, car etc..

2) See number suggestion 1.

3) See suggestion number 1.

4) Remove or lessen the barking triggers, if possible.

5) Take trainer's suggestions and practice the homework given.

I say:

1 - stop barking;

2 - stop barking;

3 - stop barking;

4 - stop barking; and

5 - stop barking.

You can google, 'stop excessive barking' & work on training the dog not to bark when there is no reason to do so.  It can be done, you just need to learn some of the tricks that will help.