I have a kindergarten understanding of football, many here are PhDs. I hope you don't mind if I ask some simple questions in this thread. Here goes... A. The other night an announcer said that a corner was being used in 'nickel situations' and that this put pressure on the corner more than usual. What was he talking about? B. An announcer last night talked about the A slot and B slot in regards to the offensive line and running game (not sure I got the jargon right it went by really fast). What was he referring to? C. Is there a good web site people can recommend to learn the nature of the different positions on the O- and D-lines? I don't know the difference between a guard and a tackle, for instance.