Om Swami
What are the basic ways to practise concentration in meditation?
Concentration on breath, sound or form
Meditation is of two kinds, concentrative and contemplative. Concentration can rest on the breath, a mantra or sound, or a form. Holding a form tires you quickly, so sit for seven or ten minutes and then take a break.
There are two basic kinds of meditation: one in which concentration is built, and one in which contemplation is done. The first is concentrative meditation, the second contemplative meditation.