Pre printing boarding cards before coming to the airport carry the risk of confusion if the boarding gate changes.
If you need to fold your boarding card to keep in pocket, avoid fold coming in the area with the bar code as it will be scanned.
If you are getting late, you can request the incharge to get a speedy security check skipping the queue.
Keep your boarding card in your pocket - helps you return to your seat after you visit the washroom.
Preserve the baggage sticker on the boarding card till you get all the pieces of check-in luggage after the flight . The sticker has the codes same as the stickers as on your luggage pieces.
Power banks are allowed in cabin baggage not in checking baggage .