The overall general theme of Mercury retrograde is about reflection. It offers us a time to be more reflective about life on planet earth, to contemplate and to create order by eliminating things that block our clarity. Therefore it is generally a good time to write, edit meditate, retreat and organize.
Based on the sign it is in at the time it makes this journey, we find more specific direction about what is required at this time. This period of Mercury Retrograde will be in the sign of Aries retrograding back to Pisces. I will write more about the theme of this particular one soon.