Don’t overstuff your bag. That makes it more likely to get damaged.
Put your name and the phone number of your destination on the inside and outside of your bag.
Don’t wrap your gifts since all luggage is subject to inspection.
Travel light when you can. Try bringing one carry-on bag that will fit underneath the seat in front of you.
Make sure your bags don’t have any straps or hooks sticking out that could get caught on something and damage your bag.
Stay within the Baggage Allowance.
Carry valuables, medication, and travel documents in your carry-on luggage.
Pack anything that might leak inside an air-tight plastic bag.
Know the rules for any of your stuff that might be considered Dangerous Goods. That includes what to do with those spare batteries.
Know the requirements for the Security Checkpoints where you’ll be traveling. There are still restrictions on Liquids and Containers.