An in-depth course on electronic components, with a plethora of example circuits to learn from

This is an incredible reference. I found it difficult to get into when I was just starting out, but when I started really building circuits and wanted to learn more about the idiosyncrasies of basic components and op amps, this book became my go-to reference. In some cases, like the voltage regulator, they build up more and more complex circuits to show you how the basic circuit works and how the more advanced features and protections are added on. This approach helped me to build my practical problem-solving skills when doing circuit design myself.