Hi udayantha11,
It is Bitcoin gold (not bit coin gold
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
) . Bitcoin gold will be a hard fork in Bitcoin's blockchain. Right now, the network is monopolized by mining pools.
Bitcoin gold aims to fight the mining centralization, so we can go back to the early days of Bitcoin when anyone could mine with profits.
All Bitcoin holders will get free Bitcoin gold, like a dividend. Then you are free to hold them or sell them straight away, that's your call.
As paolo said, get the most information you can on this forum, and Google, Youtube. etc.