I am very new to this and I am considering buying MMX as my...

I am very new to this and I am considering buying MMX as my first considered position. I have looked at the fundamentals and the day to day trades for about two weeks. The fact that the close was a bit down does not faze me. Through lack of knowledge I am wary of the fact the volume was around 1.8 million yesterday and 3 million today. Can anyone tell me if it is a concern. Does it mean an exceptional number of traders are selling? To put it another way what does volume tell us if anything?