Do light travel in a straight line?

Answer 1

Yes light does travel in a straight line and this theory is known as RECTILINEAR PROPAGATION OF LIGHT.

Answer 2

Einstein's theory of relativity has light bending due to curvature of space

Newton though had light bending due to gravity, Newton assumed light had some very small mass, while Einstein had light as zero mass

Einstein is considered correct, with Newton just a special case of a more general theory of relativity

But for shorter distances, the curvature of space is not noticeable.