Breath Awareness means paying close observations to the Breath as you allow it to come and go on its own. Observing the Breath is the passive aspect, a non-thinking, non-judgmental, non-comparative, non-analytical aspect, a meditative awareness.
You're not trying to do anything; you are just observing. It is practice, not perfect. It's a play, an exploration, something you can do any moment of the day. All you do is decide to focus on your Breath, observe it, sense it, moment to moment, essentially allowing the Breath to breathe you.
Breath awareness is a mindfulness practice or attention training, it helps to increase focus and reduce stress. One study of a simple Breath awareness practice showed that in just 6 weeks, a daily practice can improve focus, reduce stress and instill calm in the body and mind.
So take a moment to observe and sense your Breath right now. Close your eyes and bring your awareness to the Breath, don't change it, just follow it. Don't cast judgment. Just observe; whenever the mind wanders, bring attention back to the Breath.