Here, the word 'dharma' is being used in the sense of 'phenomenon', or 'object' as opposed to 'Dharma,' with a capital D, which refers to the teachings of Buddhism.

The three realms (triloka) that constitute samsara, the cycle of birth and death, are: the desire realm, the form realm, and the formless realm. Human beings exist in the desire realm. The form realm is a heavenly realm inhabited by gods who still possess form. The formless realm is a heavenly realm inhabited by formless gods.

The term 'sangha' specifically refers to the community of Buddhist monks and nuns, but it may also refer to the larger community of Buddhist practitioners.