Electronics is a practical subject. As you read through the PDF, try to simulate the circuits using free software, or better yet, build them on a breadboard.
The PDF guide "Understanding Basic Electronics" by Walter Banzhaf covers a wide range of topics, including: understanding basic electronics walter banzhaf pdf best
What is your ? (e.g., passing an exam, fixing gear, or hobby building) What tools or components do you already have? Electronics is a practical subject