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— /warn Read the rules: no screen photo.

— Read about lvalue& type.
Method returns a reference type of Point class.

— That means that you need to use normal language instead of c++

— Returning a reference in such cases is a good way to UB.
Like
Point& a = Point(10, 20).setX(15);
Or in more sophisticated case:
Point& a = (b + c).setX(15);
Or
Point& a = functionThatReturnsPoint().setX();

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— No, storing a reference on the stack is the problem here

— Just, unless you get a reference of guaranteed existence, never store a reference

— Someone can see that it's guaranteed in a specific case, then someone else can change the code on the right side so it starts pointing to a temporary.

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— I don't see a point of returning a reference here, because 2d point is usually a pod object, so it's copy is cheap

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— I see your point, but i don't see totally crazy. Actually, operator= is more or less the same and you always return a reference

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— Hello everyone I'm vaibhav aka Tommy

— 👋