How can i distinguish secret rare yugioh cards from ultra rare yugioh cards?

The god cards you are talking about are the collectibles which are the only ones without logos. A ultra rare card would have god letters in its name and the picture would have gold looking layer on it. On the other hand, a secret rare card would have a sparkling silver color in its name and it would have a sparkling layer on its picture. A ultra rare would never have a sparkling color on it.