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The point at the beginning of a ray is called the "endpoint." A ray is a part of a line that starts at this endpoint and extends infinitely in one direction. The endpoint is crucial as it defines where the ray begins, distinguishing it from a line segment, which has two endpoints.
A ray has a beginning but no endpoint.
The endpoint.
A ray does have a definite beginning, it's point, but it goes on forever in the other direction, which is symbolized by an arrow.
It depends on what the name of the initial point is because that defines the direction of the ray. If the initial point is c, then the ray must be called cd, but if the initial point is d, then the ray must be called dc.