Delta is really easy. Just click on check-in on the left side, put in your confirmation no. and it will tell you what to do. It will also tell you how to pay for your bags. You then go to the airport and either check your luggage curbside or go to the Delta kiosk and finish the check-in and then take your luggage to a counter agent for the baggage claim sticker for the luggage and to get your baggage claim stub.