The American Wood Council offers a number of free online courses in its eLearning series where you can earn CEU and PDH credits. Of interest to deck builders are

This course provides an overview of common questions and challenges with design and construction of residential wood decks, and compares the differences between IRC wood deck requirements and DCA6 provisions.

This course focuses on the vertical and lateral load paths of conventional residential decks and how they are addressed in the 2018 International Residential Code. You can find a list of all AWC courses by clicking here.