Main Examples of Presheaf Categories

We isolate 6 categories of presheaves we will use to study the structures and properties of toposes in the subsequent videos. Unfortunately, the text "Generic figures and their glueings" is currently out-of-stock: https://www.amazon.com/Generic-figures-their-glueings-constructive/dp/8876990046 . A sample of the book is given at: https://marieetgonzalo.files.wordpress.com/2004/06/samplebook1.pdf .