The phrase "buy red and sell green" refers to a common trading strategy in the cryptocurrency market, which suggests buying assets when their prices are falling (indicated by red candlesticks) and selling them when their prices are rising (indicated by green candlesticks). This strategy is based on the idea of buying low and selling high, aiming to capitalize on market fluctuations.

However, it's important to note that trading based on color patterns alone is quite simplistic and doesn't take into account the complexities of market dynamics. Successful trading often involves a deeper analysis of market trends, technical indicators, and other factors. Always remember that investing in cryptocurrencies carries risks, and it's crucial to do thorough research or consult with a financial advisor before making any investment decisions.