We've talked some about building a first aid kit and most of us have very basic first aid knowledge, but do you have any intermediate or advanced first aid knowledge?
Have you been through a CPR/First Aid class? CPR/First Aid classes are inexpensive and can give valuable skills and knowledge.
If you don't have your CPR/First Aid card, do some research and find out where the class is being held in your area.
If you do have advanced first aid knowledge, then just make sure you're up to date (as procedures are always changing) and maybe brush up on a skill or two by reading or practicing a skill.