If you’re not directly familiar with clicker training, you might be a little confused on what exactly this style of training is all about. It is a newer style (although has been known and used for many decades) of training in the sense that it took a while for dog trainers to really hook onto it.
Everyone is familiar with sit, down, and come and other similar commands that are standard fare in the general obedience training class. The novice handler might not be familiar with what competitive obedience looks like or realize that it’s really just a continuation of those basic skills.
The personality of a dog is flexible and indeterminate. Dogs can be exuberant or shy; friendly or hostile; fearful or bold; aggressive or passive or some combination of the above. These differences in personality may to some extent be determined by breed, or individual genetics, but for the most part it is based on how and to what extent each particular dog has been socialized.