Brian Shannon’s is widely considered a foundational "textbook" for traders. Rather than offering a rigid, one-size-fits-all system, Shannon provides a logical framework for understanding market structure and aligning trades with the dominant trend.
note that the hardcover can be expensive, but they generally agree the educational content is worth the investment. Core Concepts Explored Top-Down Analysis
: Used to identify the major trend and primary support/resistance levels.
Unfortunately, I couldn't find a free PDF download of Brian Shannon's book. However, you can try searching for a free preview or summary of the book on websites like Google Books, Amazon, or Investopedia.