Simply having the file on your laptop does not make you an expert. To maximize the utility of The Wine Bible.pdf, you need a protocol.
Create a digital bookmark system. Most PDF readers allow "bookmarks." Create top-tier folders: The Wine Bible.pdf
Why would a serious student seek out a PDF version of a wine book? Unlike fiction, wine study requires a different kind of interaction. Here is why The Wine Bible.pdf specifically offers advantages the print version cannot match. Simply having the file on your laptop does