Deep breathing involves taking slower, longer breaths from your stomach to counter the short, rapid breaths that you default to routine life.Focus on breathing from your stomach, pushing your stomach out each time you inhale. Take longer breaths, counting to at least three for each inhalation and exhalation. Keep doing this even though it may feel uncomfortable at first. After a while, you will start to notice your body feeling more relaxed.

Noticing the differences for yourself in how your body feels is more powerful than anyone describing it to you. Deep breathing may be simple, but it isn’t necessarily easy. It can quiet your nervous system in a short amount of time, though it probably won’t provide instant relief from all anxiety. The more you practice, the better you’ll get at it and the more you’ll be able to use it in times of stress to help calm yourself
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The best breathing technique (belly Breathing)

Sit or lie flat in a comfortable position.

Put one hand on your belly just below your ribs and the other hand on your chest. Take a deep breath in through your nose, and let your belly push your hand out. 

Breathe out through pursed lips as if you were whistling. Do this breathing 3 to 10 times.

Or begin with just 5  minutes a day, and increase your time as the exercise becomes easier and more comfortable.  Practice multiple times a day. Schedule set times or practice conscious breathing as you feel the need.

Deep breathing in morning for 10 minutes

Another way of simple breathing 40- 50 cycles (In & out) might take 10 min maximum, that helps to keep the body active whole day.

Breath works is also the base of mindfulness , so an effective meditation tool too.There are various types of breathing type The two ways here are simple techniques any body can practice found amazing for students , to enhance focus and memory , reduce blood pressure, diabetes management