Another thing to remember is that the clicker is just a marker.
Anyone who trains uses markers, even tho they may not realize it.
The "click" says to the dog who is trained this way, "YES!! You got it right!"
I don't use a clicker per se, I find them awkward. I just use the word YES!
Same principle. Pup learns that when he hears YES! he just went bingo and there is a reward coming. Each time you reward any behavior, it is more likely to happen again.
Each time you negatively reinforce a behavior by whatever means, a word, a touch, a look, that behavior is LESS likely to happen again.
Slick, it is EXCELLENT that you are reading and learning and educating yourself about training.
Keep it up, and if you have more questions, ask away.