Professional trading techniques and trading systems are based upon the underlying principles of financial market price movement, and are the trading techniques and trading systems that are used by professional traders.
Trading gimmicks are based upon the underlying principles of taking advantage of new traders that do not know any different, and are often the so called trading systems that new traders use to blow up their trading accounts.
If you do not know the difference between a professional trading technique or system and a trading gimmick (which is the case for most new traders), my article explaining the difference between professional trading techniques and systems and trading gimmicks will help you avoid falling foul of a trading gimmick.