Question..if all started with a “big bang” from one point then shoun’t all galaxys be expanding away from that point and each other?
You are not supposed to ask questions like that.
Now, go back in to the corner and stay there until we tell you you can leave!
CA....
There is no point in the universe which is the center of expansion. The universe is LIKE the surface of a sphere which is expanding ... every point on the surface is equivalent, and each point sees everything receding from it.
Ah, but how then can the Andromeda Galaxy be approaching us? The answer is that it is nearby, and the expansion is reflective of a tendency over a much larger scale. The collision of Andromeda with the Milky Way is a local event, like an asteroid strike on the earth.