Many of the questions newcomers have may be found within one of the links below. This list is by no means exhaustive and will be updated as necessary.

Check out the Wikipedia Page for a brief overview.

Tom Voigt’s comprehensive Zodiac Killer site can be found here.

Richard Grinell lays out the information in a very easy-to-read format and has a lot of pictures, etc. to peruse through at www.zodiacciphers.com.

The FBI case file on the Zodiac can be found at the FBI Vault here.

As with these (and any other resources), I do not claim accuracy with any of them - in other words, do your own fact-checking and use common sense when making assertions.