Meanings of "Dharma"

Dharma in the Buddhist scriptures has a variety of meanings, including "phenomenon", and "nature" or "characteristic".

Dharma also means ‘mental contents’, and is paired with citta, which means heart/mind. In major sutras (for example, the Mahasatipatthana sutra), the dharma/citta pairing is paralleled with the pairing of kaya (body) and vedana (feelings or sensations, that which arise within the body but experienced through the mind).

Dharma means the source of things and Truth.

Dharma is also used to refer to the teachings of the Buddha, not in the context of the words of one man, even an enlightened man, but as a reflection of natural law which was re-discovered by this man and shared with the world. A person who lives their life with an understanding of this natural law, is a "dhammic" person, which is often translated as "righteous".

The Buddha would teach the Four Noble Truths, the Noble Eightfold Path, the Three Marks of Existence, and other guidelines in order to achieve the freedom and liberation from suffering.
From Wikipedia