What are the basic constructions required by Euclid's postulates?

The basic constructions required by Euclid's postulates include drawing a straight line between two points, extending a line indefinitely in a straight line, drawing a circle with a given center and radius, constructing a perpendicular bisector of a line segment, and constructing an angle bisector. These constructions are foundational in Euclidean geometry and form the basis for further geometric reasoning.