Despite being outplayed, Nabil Ghilas almost grabbed a winner for Cordoba in stoppage time when Almeria was caught on the counterattack, only for the substitute forward to fire the ball straight at goalkeeper Ruben Martinez.
"I think we carried the weight of the game, and we are heading in a good direction," Edgar said. "We have to remain calm, the first win will come."
On Saturday, Spain's four Champions League teams meet.
Four months after winning the title for the 10th time, Real Madrid hosts Atletico Madrid in a rematch of last season's Champions League final, while Barcelona looks for its third win in as many rounds against Athletic Bilbao.