If memory serves, I've been in the hobby around 33 years. Listen and learn from others; share your own experiences. It's been amazing to see what has come about in the hobby over the last decade. In the beginning (for me), Martin Moe's first two books (The Marine Aquarium Handbook and more importantly, The Marine Aquarium Reference) were both full of crucial information. I wore the Reference book out and bought the next edition. lol Other books and articles from Calfo and Sprung were essential as well. Online forums have advanced the hobby for me to a whole new level. The ease at which we can search and share information, ask questions and get opinions from those who have been there before is just amazing. Thanks Reef2Reef, WetWebMedia, ReefCentral, BRS and others who facilitate greater knowledge.