Many behavior genetics instructors make their materials freely available online. See below for links to training materials:

Greg Carey’s Intro to Behavioral Genetics Course (includes syllabus, readings, slides, and links to course webpages) 

Materials from the Summer Institute in Social-Science Genomics co-hosted by Dan Benjamin (including problem sets, reading list, lecture videos)

Baptiste Couvy-Duchesne’s slides on PRS and Mendelian Randomization