How aware are you? In which aspects are you aware?
If you ask two people to describe an accident, you are likely to get two completely different descriptions. You may even wonder if the two people are telling you about the same accident.
Each person was giving details of what they were aware, hence awareness can be broad or narrow, focused or general and so on.
In order to change habits, it is necessary to be aware of the habit. For instance, if you bite your nails, you may do it without realising. Only when you become aware that you are biting nails, do you have the choice as to whether you continue, or whether you stop.
Think of a habit you would like to change and start to become aware of when the habit occurs.