However, there are two things I would like to share that the article doesn't mention but are of deep importance when it comes to directing attention and 'mastering' one's mind.
First, approaching this as a way to 'master' or conquer your mind isn’t going to take us very far. There is nothing to master. Our minds are the ones wandering, and we, as living conscious beings, can observe the mind and make use of it. However, the idea of mastery is the mind itself trying to master itself, which won't lead us anywhere. If one thinks they have mastered their own mind, it is just the mind in control again, and you are merely acting on its desires rather than on intent that comes from deep within.
Second, and of extreme importance: one cannot give their full attention to the present out of fear. To many, this may sound strange and incomprehensible, but from my own experience delving into meditation and exploring my consciousness through altered states (e.g., hallucinogens), I can confirm that it is fear that prevents us from giving all of our attention even to the smallest things: a still object, a sound, or the feeling of your feet touching the floor. All of these sensory experiences, which for the most part occupy and illuminate the present moment, require something that is the ultimate fear of our minds: death. To be totally present in the moment is to die to the ever-restless and busy mind, and the fear of this death is no different to your mind than the fear of physical death. Even if temporary, full attention in the present moment represents the end of your dreams, desires, and sense of identity, along with everything that permeates it. I know this because the liberation that comes through certain drugs unlocks the potential to fully focus on the present moment. When you try, you may fail miserably because you start fearing what you sense and what you see.