How to guide clearly explains: The terminology and components of roof framing, Step-by-step instructions for laying out common rafters, Three quick methods for figuring rafter lengths.
Buy Roof Framer's Bible: https://www.roofbible.com

0:00 Intro
0:58 What is a gable?
1:43 What is a common rafter?
2:34 Run and rise
5:07 Intro to framing square
7:20 Rafter lengths – 3 methods
11:42 Step-off method
13:35 Rafter table on framing square
14:30 Roof Framer’s Bible
16:17 Laying out a common rafter
18:59 Easily frame any roof

Author’s Bio:
Barry Mussell started framing houses over forty years ago. He built over 300 homes and commercial buildings with his own hands, before taking on the role of Framing Manager for a large home builder. He trained and supervised hundreds of framing crews who built more than 18,000 homes across the southeastern United States. Thirty years ago he wrote Roof Framer’s Bible – The Complete Pocket Reference to Roof Framing. It has been sold all over the world. He is now focused on training the next generation of carpenters and tradesmen.