Buying cryptocurrencies is advisable during periods of market downturn or correction, seeking discounted prices. Strategies like DCA (Dollar-Cost Averaging), buying small amounts regularly, smooth out volatility. An entry is sought when "fear" dominates the market or technical indicators signal oversold conditions.

Selling cryptocurrencies is timely when predefined profit targets are reached or when market indicators show "greed" or overbought conditions. It is also wise to sell if the fundamental project of the cryptocurrency changes negatively, if it does not align with your strategy, or if there are signs of a forthcoming major correction. Always manage risk and do not invest more than you can afford to lose.