In generally, binary trading option is a difficult job. Initially it is needed to spend a lot of time to gather knowledge which improved skills. Some important terms which frequently use in binary trading are broker, call option, charting, currency pair, expiry time, at the money, in the money, out of the money, market price, strike price, range option etc. People have to knowledge about all the terms of this trading. To know more about the binary trading options you can visit this site blog sits
Nadex binary options don't have rebates on losing trades, but if you buy an option at 50, and it drops to 30, you can sell it for a partial loss, instead of waiting for it to drop to 0 (or move above 50, which would produce a profit). Ultimately though, at expiry, the Nadex option will be worth 100 or 0. Therefore, when determining your risk you must assume the worst case scenario. 
A binary option is a financial exotic option in which the payoff is either some fixed monetary amount or nothing at all.[1][2] The two main types of binary options are the cash-or-nothing binary option and the asset-or-nothing binary option. The former pays some fixed amount of cash if the option expires in-the-money while the latter pays the value of the underlying security. They are also called all-or-nothing options, digital options (more common in forex/interest rate markets), and fixed return options (FROs) (on the American Stock Exchange).[3]