A lot of people have asked me how they can meditate; specifically how they can stop the constant flow of thoughts they have everyday.
A physical point in the body: the third eye, tip of the nose, the point between the tip of the nose and the upper lip, where the air comes in and out, etc.
A mental concentration on an emotion, like love, compassion, peace, etc.
There are no limits for these objects of concentration. The Buddhist calls it “Mindfulness”, which is otherwise being conscious, alert, thoughtful, observant and so on.