CFDs are complex financial instruments and carry a high level of risk due to leverage. A significant proportion of retail investors incur losses when trading leveraged products such as CFDs. You should carefully consider whether you understand how CFDs work and whether you can afford to take the high risk of losing your capital.
Dark pools are private trading platforms where institutional investors buy and sell large blocks of shares without making the details public until after the trade is executed. They operate outside regulated exchanges and enable the trading of enormous volumes without affecting the market price. It is estimated that they account for between 30% and 40% of total stock volume in the United States.