how come when I looked at PUT options on the SPY at Yahoo finance today I saw the same strike price TWICE with different prices? How you know which one to buy? I plan on giving a talk in skool about options but now I dunno if I will as I am confused myself.
No, it's not American vs European. It's regular vs quarterly. The symbols starting with "S" expire on the third Friday as normal. The Symbols starting with "R" expire at the end of the quarter (i.e. the last business day of the quarter).