Zerg Macro

Having played Terran for a long long time I switch to Zerg a while back because I wanted to try something fresh but I can't make my way out of Silver league and even Bronze league (demoted the other day D: ) and the most unhelpful help I've had so far is 'oh you need better macro'. That is useless information to me because I don't even understand what Zerg macro would entail as a whole. Terran is easy because you just gotta keep the lights flashing but as Zerg wth does it actually mean to macro. If anyone can attempt to help me that would be great, links to daily's would be appreciated. :)