I are now reading the materials. But I found the materials are very beief and abstract. I even don't know what is their meaning. For example like the concept of beta distribution approach and kernel modeling in credit risk topic. There is no example and clear elaboration of how the approachs are working. I found many concepts have this problem. Does it mean I need to memorize the concept by heart without understanding. Or I need to find other reference to study. Pls help.