I noticed on the Reddit UFO forums that many newcomers are asking about UFOlogy books, and two sources where many free, very good UFO books are available. One is Amazon Kindle Unlimited, about 12 bucks a month Then get the Hoopla digital library app on your PC, and if you have a library card, there are hundreds to thousands of free UFO books. Also, the new James Fox Moment of Contact: New Revelations is free on Roku