I don't really understand it's full purpose, I know it can be used on ladder slasher, hourly raffle, what other stuff is it used for? Are there more games other than ladder slasher you use it for? Is there a shop or somewhere to spend it?

Forum gold (fg) is the main currency used for any trading subforums on d2jsp.

Here are some info pages with some more details:
What is Forum Gold?
What can I do with Forum Gold?
How do I get Forum Gold?

Thank you again amigo, you've been very helpful!

Hello,

Read 'New users guide' for D2jsp to learn about the forum!

Most of your questions can be found here in the General Help Unified Sticky

Also, these specific links will help you get started trading on the forums.

What is Forum Gold?
How to Trade on d2jsp
How To Request A Mediator And Prevent Scams
Forum Rules
Trade Rules
Signature FAQ

Have fun here and remember to trade safely by using a Mediator!

Good Luck!

If you have any further questions you can send me a Private Message

Depending on what games you play you can get in game currency(s). Such as Runescape gold. Diablo 2 items. Ladder slasher items.

You could even get steam and battle net balance.