These are good materials for anyone interested to know about Bitcoin but sadly Op has suddenly disappeared. I don't know but I'm not sure if he went through this thread after posting. This is why some people see posts like this as not genuine and not worthy of attention. Numerous threads have discussed about this topic before but none of them (poster) follow up to give us a feedback. Probably, only few of them have genuine interest to learn about bitcoin. Their feedback is a motivation for expert to turn up with suggestions and recommendations always.