Question about how the fees work (limit orders)

do u guys know how the fees work on binance?

if u place a limit order for example, for $2k, the limit order shows as $1997

does that mean i pay 3$ in fees?

i know if You have BNB, the fees get subtracted from your BNB balance, so why are they also subtracted from the limit order?

Also, if I cancel the limit order I get back the full amount correct?

Is there anything else to do to reduce fees besides just holding bnb?

Thank you