how do i copy the entire scene and project so i can work form another computer on it?

I have been trying everything I copied the entire folder
I exported the entire scene and then entore project but still when I try to open it on another pc it wont open says error" could not open"

so how do I do this please help ive been trying for over 2 weeks and still no luck

If you have the same versions of unity copying the entire project folder works for me.