If we want to send data from one shader to the other we'd have to declare an output in the sending shader and a similar input in the receiving shader. When the types and the names are equal on both sides OpenGL will link those variables together and then it is possible to send data between shaders — (this is done when linking a program object).
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Components of a vector can be accessed via vec.xwhere x is the first component of the vector. You can use .x, .y, .z and .w to access their first, second, third and fourth component respectively. GLSL also allows you to use rgba for colors or stpq for texture coordinates, accessing the same components.
I really don't like that modern notion of 'I don't need anyone.' I see a lot of young women feeling they have to be that way, they have to be hard, in a way. And what does that bring them? They're just going to be lonesome. They're going to be, at best, lonesome and capable, at worst, lonesome and hard. And is that what we want? No.