It would help if you specified whether the book is a textbook, if it's a dead tree book or ebook, or if it might even be an online "book" like the Stacks Projec

It would help if you specified whether the book is a textbook, if it's a dead tree book or ebook, or if it might even be an online "book" like the Stacks Project: https://stacks.math.columbia.edu/ https://stacks.math.columbia.edu/