Trading strategies depend on directional correctness at varying degrees to make money. 'Direction' refers to the positive or negative change in price. Some strategies, like are dynamic and can profit from either directional correctness, the passage of time, or contraction – their profitability is not necessarily dependent on any single factor.
Other strategies are more rigidly dependent on share price and MUST move in a specific direction for the strategy to turn a profit. For example, can only profit if their value rises. Therefore, if you establish a long share strategy, you must correctly guess or predict which will rise in value. Your statistical odds of correctly picking direction (at least in the short term) are approximately 50%.