Whether you have the PDF or the hardcover book, ensure you master these fundamental topics from the 8th edition:
: Be cautious with sites offering "direct" PDF downloads, as many contain snippets from other authors (like Hibbeler or Gere) instead of the Beer & Johnston 8th edition. Whether you have the PDF or the hardcover
: Transformations of stress/strain and energy methods. Whether you have the PDF or the hardcover