What is the simplest most profitable trading strategy?

Could you please elaborate on what you consider to be the simplest and most profitable trading strategy? I'm interested in understanding the core principles behind this approach and how it can be effectively implemented in the realm of cryptocurrency and finance. Could you provide some examples or case studies to illustrate its profitability? Additionally, are there any specific conditions or market environments where this strategy is particularly effective? I'm keen to learn more about its versatility and adaptability in different trading scenarios. Thank you for your insights.