what good does it do me to learn specific hands?

I have been looking at this forum for a while, and I understand that this forum has helped a lot of people out in their poker playing and strategy. I am just unsure of how learning what people do in specific hands in specific positions, etc... helps them. Even if they memorize exactly what the people who post tell them to do, how is this going to help them every time, in every situation? Also, I am curious as to how this forum is most beneficial to poker players. How does one get the most out of it? Thank you very much, I pray I do not sound horribly ignorant.