I want to learn about holograms. I have zero knowledge of how they work. How can I start? I tried using Google but I cannot decide where to and how to start. Can you suggest any good sites for this purpose?
The best place to learn about holograms and how they work depends on your background. The book, "Optical Holography" by Collier, Burkhardt and Lin is for readers with a good math background, but a diligent reader can get a huge amount of information by reading between the equations. That was my holography bible "back in the day". The book, "Holography Handbook" by Fred Untersehr, was a standard for artists and hobbyists getting into holography back in the 1970's and 1980's; it had a few unimportant technical errors. There is a hologram-making kit you can get on Amazon for something over $100, made by Liti Holo. For a similar price you can get hologram-making kits from Integraf. Note: you definitely do not need a technical background to learn about how holograms work and how they are made. You can find plenty of explanations online, both written and in video form; and probably the kit would give you at least a great intuitive grasp of the subject.