I am probably about in the same spot that you are. I've been slowly working my way through this course from Andre LaMothe, I think pieces of it might be applicable for you. It's a Udemy course, so it goes on sale for ~$20ish pretty often, I think it's really well done and I've learned a lot so far.

https://www.udemy.com/course/crash-course-electronics-and-pc...