Bitcoin will split in a hard fork. If you own Bitcoin at 25 October, you will still have your Bitcoins after the hard fork, but you will also get Bitcoin Gold. The hard fork is a good opportunity to increase the value of your Bitcoins. However, you can expect the Bitcoin price to drop a few days before the hard fork.
If you want to exchange your Bitcoins before the hard fork, you should do it as early as possible. If you want to buy more Bitcoin, you should wait until right before the fork when the price is low.
if you want to exchange cryptocurrencies, you should use Quasar Exchange. They offer the best prices and you don’t need an account to use their service.