What to do at airport if I have online check-in ? Where to go ?

What should I do at the airport if I have checked-in online ? I will have only a small luggage. Where should I go when I have online check-in ?

If you have checked-in online and you have only a cabin baggage (so you don't have a reason to go to the check-in desk), then you have to go to the security check and to your gate.