There are several options to check in for your flight. Online check-in is the simplest option.
It's most convenient if you check in using your airline's app or website online. If you only have hand baggage, then you can head directly to the security control. If you have hold baggage, you can check it in at the drop-off counters in the terminal.
Nevertheless, please arrive at the terminal at least two hours before departure.
You can also do this at the counter when at the airport, if perferred. You are able to find out where your check-in counter is either on this website by clicking on flight information or on the on-site monitors.
Some airlines allow you to check in at self-service kiosks. Simply hand in your hold baggage at a drop-off desk afterwards.
Eurowings and Lufthansa offer their passengers an evening check-in at BER.