I’m sure the OP has found a book/course by now, but here’s another one to add to the list. A former electronics instructor of mine just released an introductory electronics book geared toward audio professionals called “Electronics Concepts, Labs, and Projects: For Media Enthusiasts, Students, and Professionals”. It covers electronics theory, basic soldering, troubleshooting audio gear, and how to make TRS and XLR cables. A few video tutorials are included as well.