Hey man, the first thing you should do is read "The Game" by Neil Strauss and The mystery method, those two books are really great to get you into the community. About your question:
1) He wants to say that women tend to say one thing while they feel something different. If u ask a woman what does she like in a man, shell probably tell you that she likes to be treaten good, get gifts, etc, but the reality is that women r often atracted by guys who tease them and dont treat them right. Its not the best example you can get, but i think you'll get the idea
2) An ioi is something the girl does to show interest in you. They include touching her hair, leaning towards you, touching you, giggling a lot (specially about something that its not funny), etc
3) Never heard about it, maybe someone else can tell you about it