I've been getting into druids lately but i heard that everything we have on them can fit a a single sheet of paper ill gladly read the author that writes that sheet the best can anyone recommend some?
Ronald Hutton's The Pagan Religions of the Ancient British Isles is probably the most comprehensive summation. Hutton has a number of other more popular works on the subject, including The Druids and Blood and Mistletoe. I've read the latter and it is an interesting resource though more focused on the legacy of 'druidism' and modern paganism as a social phenomenon.