Best place for learning GolfScript?

A cached copy of the offical site is available on the Internet Archive's Way Back Machine.

GolfScript is a nice language, but, as you already said, the official webpage is down. While I don't claim to know the future, this probably means that no bugs will be fixed and no new features will be implemented. In fact, the latest version of the Ruby interpreter was released in 2013.

GolfScript also has a few annoying quirks (e.g., no character type), is very slow and bound to lose in contests where you'd need to use commands such as base or print, which are simply too long for a golfing language.

Where am I going with this? Learn CJam instead!

CJam is inspired by GolfScript, so almost everything you can do in GolfScript, you can do in CJam as well.

But:

• It's easier to use.
• It's more powerful.
• It's faster.
• It's shorter.
• It has a client-side online interpreter.
• Its developer is active on this very site.
• It's released under the MIT license.
• It's supported by several members of this community by submitting bug reports/feature requests, golfing tips and third party documentation.