It can really be most worthwhile to start with the introductory Engineer's Mini-Notebook volume, "Getting Started in Electronics" where everything is so simple. Once available at Radio Shack for $2.49:
Then work your way through the other Engineer's Mini-Notebooks of interest and you will be able to recognize all kinds of other resources that can be helpful to build on this foundation in similar ways.
Regardless of your objective you will need a foundation in analog circuits and here's a classic reference for schematics:
https://archive.org/search.php?query=%22Engineer%27s%20Mini-...
It can really be most worthwhile to start with the introductory Engineer's Mini-Notebook volume, "Getting Started in Electronics" where everything is so simple. Once available at Radio Shack for $2.49:
https://www.scribd.com/document/103603952/Engineer-s-Mini-No...
Then work your way through the other Engineer's Mini-Notebooks of interest and you will be able to recognize all kinds of other resources that can be helpful to build on this foundation in similar ways.
Regardless of your objective you will need a foundation in analog circuits and here's a classic reference for schematics:
https://archive.org/details/howtoreadschemat00herr