At a busy Schiphol it can sometimes be difficult to see if you are in the right queue. If you still need to check in or drop off your baggage, you should join the queue at the check-in desks. Look up your flight or use the Schiphol app to find out which desk you need to go to. If you have already checked in and dropped off your baggage, or if you are travelling with hand baggage only, go straight to the queue for the security check. Check which gate you need to go to so that you join the correct security queue. Your gate number is on your boarding pass and in the Schiphol app. When in doubt, you can always ask a Schiphol employee.