Usually, when someone has never actively controlled their breathing before, I have found that their breathing is continuous; in, out, in, out. The next step in breath control and awareness is to add a pause.
So often when asked to take a deep breath, many people simply take a big breath at the same depth as a normal breath. Big and deep are often confused as the same thing when actually, they are very different.
One of the simplest meditations one can do is to focus all of your attention on your breathing. This is called a ‘focused attention meditation’
Breathing is a big part of meditation and there are good reasons why it is a focal point.