How to become really knowledgeable in a field

1. Get a Goodreads account.
2. Read an introductory level book.
3. Read the "recommended reading" lists or "further reading" notes that are at the end of many introductory level books.
4. Put all those books in your Goodreads account's "to read" list.
5. Read those books.
6. Add the books in those books' "recommended reading" or "further reading" lists to your Goodreads account's "to read" list.
7. Read those books.
8. Repeat steps 5-7 until you have become really knowledgeable in a field or at least expanded your basic knowledge of that field.

• Tip: I also "follow the footnotes" and put the books in the bibliography  or footnotes at the bottom of the pages to my "to read" list on my Goodreads account.