user7903: Most of the time we are under control of our mind and old habits.If a beginner wants to break the old habits and get more control of it.From where do they should start ? 

user151: Stop trying to control is a good way to gain  some control(: Insight meditation(I assume your talking about insight so if your practicing something else than this answer probably doesn't apply) is so easy in a way because the only thing you ultimatly have to do is experience what is going on in your own experience. Although it's good to do preliminary stuff like doing good sila so that the mind can better become clear and concentrated and making sure the facilities are ballanced. In insight meditation there are ways to control your own faculties but it's better to find a good teacher. They will know how to guide you so your practice is effective. -Good luck 

user8044: The short answer is BE WISE. BE PURE IN DEED, SPEECH AND THOUGHT.
The wise are controlled in deed, they are controlled in speech, they are controlled in thought. Only if you could stay heedful, would you be able to put out the fire of lust (Ragaggi), the fire of hatred (Dosaggi), and the fire of delusion (Mohaggi) that are waiting to flare up at any moment. We all have these traits to a lesser or greater degree. Otherwise we cannot be living in the society. Since one does not live alone, living in unity in society requires self-awareness, self-control, adaptability, non-violent attitude and good-will. Buddhists are taught to diffuse the Four Divine States of Mind: loving-kindness, compassion, sympathetic joy and equanimity towards all sentient beings who may be of different nationalities, religions and environments. The Five Precepts that we follow help us to abstain from killing, stealing, sexual misconduct, false speech, and intoxicants which cause carelessness. We should be kind, honest and mindful. Then our society will reach the goal that persons can live together peacefully and in mutual trust. In the scriptures it is said:

"Good is restraint in action,
             And good restraint in speech,
             Good is restraint in mind,
             Restraint throughout is good.
             Well guarded is he said to be
  Who is ashamed of sin, in all things self-controlled "'


user8157: One starts by seeing with insight how the old habits are disadvantageous, unsatisfactory (incapable of bring lasting hapiness), dangerous, harmful &/or promote suffering. 
One starts by seeing with insight the advantage & benefit of giving up those old habits. 
The Dvedhāvitakka Sutta is one of many suttas describing how the Buddha, before his enlightenment, reflected upon the advantages & disadvantages of differing types of thinking.
The Upanisa Sutta states a cause of faith in Buddhist practises is the experience of suffering.

7903: <p>Most of the time we are under control of our mind and old habits.If a beginner wants to break the old habits and get more control of it.From where do they should start ? </p>
 151: <p>Stop trying to control is a good way to gain  some control(: Insight meditation(I assume your talking about insight so if your practicing something else than this answer probably doesn't apply) is so easy in a way because the only thing you ultimatly have to do is experience what is going on in your own experience. Although it's good to do preliminary stuff like doing good sila so that the mind can better become clear and concentrated and making sure the facilities are ballanced. In insight meditation there are ways to control your own faculties but it's better to find a good teacher. They will know how to guide you so your practice is effective. -Good luck </p>
 8044: <p>The short answer is BE WISE. BE PURE IN DEED, SPEECH AND THOUGHT.<br>
The wise are controlled in deed, they are controlled in speech, they are controlled in thought. Only if you could stay heedful, would you be able to put out the fire of lust (Ragaggi), the fire of hatred (Dosaggi), and the fire of delusion (Mohaggi) that are waiting to flare up at any moment. We all have these traits to a lesser or greater degree. Otherwise we cannot be living in the society. Since one does not live alone, living in unity in society requires self-awareness, self-control, adaptability, non-violent attitude and good-will. Buddhists are taught to diffuse the Four Divine States of Mind: loving-kindness, compassion, sympathetic joy and equanimity towards all sentient beings who may be of different nationalities, religions and environments. The Five Precepts that we follow help us to abstain from killing, stealing, sexual misconduct, false speech, and intoxicants which cause carelessness. We should be kind, honest and mindful. Then our society will reach the goal that persons can live together peacefully and in mutual trust. In the scriptures it is said:</p>

<blockquote>
  <p>"Good is restraint in action,<br>
             And good restraint in speech,<br>
             Good is restraint in mind,<br>
             Restraint throughout is good.<br>
             Well guarded is he said to be<br>
  Who is ashamed of sin, in all things self-controlled "'</p>
</blockquote>
 8157: <p>One starts by seeing with insight how the old habits are disadvantageous, <em>unsatisfactory</em> (incapable of bring lasting hapiness), dangerous, harmful &amp;/or promote suffering. </p>

<p>One starts by seeing with insight the advantage &amp; benefit of giving up those old habits. </p>

<p>The <a href="https://suttacentral.net/en/mn19" rel="noreferrer">Dvedhāvitakka Sutta</a> is one of many suttas describing how the Buddha, before his enlightenment, reflected upon the advantages &amp; disadvantages of differing types of thinking.</p>

<p>The <a href="http://www.accesstoinsight.org/tipitaka/sn/sn12/sn12.023.bodh.html" rel="noreferrer">Upanisa Sutta</a> states a cause of faith in Buddhist practises is the experience of suffering.</p>
