a goat: the common herd animal, most often the she-goat
This is the ordinary word for a goat in the Hebrew Bible, and most often it names the female of the herd, the she-goat. Goats were everyday livestock, kept alongside sheep for milk, meat, hides, and hair, so the word turns up wherever flocks, food, gifts, and sacrifices are in view.
In worship the goat is a standard offering. A she-goat could be brought as a sin offering, and a goat without defect was acceptable for several kinds of sacrifice, which is why the word clusters thickly in Leviticus and Numbers. In daily life it appears in payments and gifts (the young goat Judah sends), in pastoral scenes (Jacob's spotted and speckled flocks), and in poetry, where a flock of goats streaming down a hillside pictures a woman's flowing hair.
The word does not by itself specify age or sex apart from grammar; a young goat is usually called by other words (a kid), and a separate term names the full-grown male. What this word adds is simply the animal itself, the goat as a kind.