Marketable/aggressive pricing: limit order below the best bid price and above the best ask price, because it is likely to execute fast…. wrong right???? that is the definition of BEHIND the market…. where the  limit order below the best bid price and above the best ask price, and you need the price to move so your order executes…… 

then, if I am right, a aggressive pricing should be above the best bid, and below the best aks… right????

and for best bid = highest price to buy ; ask = lowest price to sell, right?

Thank you in advance