List of different sites and tutorials I found helpful, will be updated from time to time. Feel free to add yours in comments!
Most SL photographers and people who take photos on daily basis know how to make high resolutions snapshots in world. If you are just starting out and want to learn how to make your photos have that quality look, here are some basic tips that I have found following various tutorials. They are only things I use and I don't claim my way is the best possible:)