Actually you are asking 2 different questions. If you specifically are interested in angles of framing, purchase a book on framing and another on advanced framing. As far as books on repairing porches, fine home building has a book about decks that the first half is mostly about porches.
I bought a book at HD called 'Sheds and gazebos' for my son, the musician. He wants me to build him a shed, I gave him the book and told him to design it and I would help HIM him build it.
It's pretty good, covers compound angles and even hurricane tiedowns.
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