I love when people talk about the wrong "derivative" of a product. Oh ignorance is so bliss.

There/their/they're 
$ES_F $SPX $SPY
$NQ_F $NDX $QQQ
$CL_F $USO $XLE
$GC_F $XAU $GDX

KYP - know your products 

How can you KYR if you dont KYP?