Reddit mentions of The Hoosier Mama Book of Pie: Recipes, Techniques, and Wisdom from the Hoosier Mama Pie Company

The Bread Baker's Apprentice by Peter Reinhart is my number one recommendation for bread. Im also a big fan of Tartine Bread by Chad Robertson. His first book, Tartine is also great btw. I would skip out on Tartine Book No.3 though which seems to have too many errors for my liking. Flour Water Salt Yeast by Ken Forkish is also one of the better bread baking books out there.

For general baking, im a big fan of Bouchon Bakery. And one book that will surely help you improve as a baker and I highly recommend you cook through is The Art of French Pastry by Jacquy Pfeiffer. Its like a pastry arts class in a book. I am actually cooking my way through this. If you have a serious sweet tooth, Momofoku Milk Bar by Christina Tosi will probably be what you're looking for. And as someone else recommended, the Baked books are all great.

For cakes, it has to be The Cake Bible by Rose Levy Bernanbaum. This is probably the best cake book of all time. I would supplement this with Toba Garrett's Professional Cake Decorating book.

For pies, my favorites are Four and Twenty Blackbirds and Hoosier Mama. One that I haven't tried but am planning to buy is First Prize Pies. If the book lives up to their reputation, it should be an excellent book.

For plated, more ambitious desserts, I like Payard Desserts. I refer to this when I want to impress company.