A long call option strategy is a single-leg strategy where you are ultra bullish on the future direction of the stock and as a result buy a call option looking for the stock to make a dramatic move higher. Long call options are very vulnerable to moves in implied volatility and time decay. These are the first options that most investors are taught (despite their low success rate). Unless we use them for hedging purposes, we do not trade single-leg call options as part of our portfolio.