I recently bought the books "Buds for Less" and "The Big Book of Buds Vol 3" and I found Buds for Less especially helpful. It helped me get over my obsessing about leaves getting yellow and dying. It's just part of the process of ripening and is a good sign your moving forward.

Buds for Less
Amazon.com: Marijuana Buds for Less: Grow 8 oz. of Bud for Less Than $100 (9780932551870): SeeMoreBuds: Books

Big Book of Buds series of books
Amazon.com: big book of buds 4: Books