Question

we have seen how a rocket launches but how it is landed

Answer 1

mostly the rockets and left over the sea to sink..and to break..
but in case of others many times it comes to its location from where it was launched ....as we mostly see in....movies. ..

Answer 2

a rocket never lands back on earth...as it launches it gets disintegrated in the space slowly the parts get removed...if its probably a satellite being send then it will remain suspended in the air but if its send for exploraing the planets we find that it has arms in the lower parts that is controlled using computer that comes out on commanding it and simply comes down slowly on the surface standind over the arms...
if it have to return back it comes back and on the same way it lands in earth standing over its arms