When you are not sea kayaking, you can read about sea kayaking! I recommend the following books to get in the know. You can paddle for years with just the basics, but there are techniques that you may need in certain situations that will begin to benefit you as soon as you learn them. For example, the sculling draw stroke will allow you to move your kayak sideways across the water. This can be very useful for siding up to the dock or another kayaker. More importantly, you should learn early on techniques for re-entering a kayak in the event of an emergency. There are several alternatives to learn. No one plans to capsize, but when you do, you need to know what to do. Most people underestimate the time it would take them to get back in to the kayak, so it is best to learn the techniques, then practice them under good conditions with a buddy who can help you if you get into trouble. So, these books will not only provide you enjoyable reading, but will also prepare you for emergencies.
These books focus on how to sea kayak, other recommendations will focus on trips, locations, and stories about adventures.
Disclosure: I am an affiliate with various retailers on the internet, so I may make a commission on the purchase of certain items that I recommend.