How to store ground coffee?

I have recently purchased ground coffee for the very first time in my life. I have finally decided to shift from instant coffee to specialty coffee. But as I was researching about it I learnt that ground coffee is like fruits and they get oxidised which ruins it. And I also learnt about de gassing valves. So should I keep my coffee in the bag itself in which it came or should I store it in some specific kind of container? Also is it the same for whole beams and ground coffee or is there a difference in storage methods for both of them?