Hello. I'm interested in learning more about world and US gold coins. What books are good to read?

I can recommend a few:
The redbook
Coin Collecting for dummies by Ron Guth
PCGS Guide to counterfeint and grading

Thank you !

"A Handbook of 20th Century United States Gold Coins, 1907-1933" by David W. Akers
"A Guide Book of Double Eagle Gold Coins, A Complete History and Price Guide" by Q. David Bowers
"United States Gold Counterfeit Detection Guide" by Bill Fivaz

I own the ANA standards for grading
The PCGS grading and counterfeit detection guide (the combo book version)
Walter Beens encyclopedia of US and colonial coins
The Blue book (for more realistic prices of what you can get and should pay)
The Cherrypickers guide (not for gold, but worthwhile regardless)

There are dozens more books I WANT to get, including all the VAM books for Morgan and Peace dollars, and all of the die listings for early us coinage flowing hair to bust series. Which those few research books alone can cost a couple hundred......meh.

You might want to take a look at this book:

http://goldcoinsoftheworld.com/

For general recognition and weight I use Krause Gold coins of the world

For forgeries I use internet
There is a complete book with many forgeries on the net

http://www.moneytrend.at/wmf/index.html