Hello, it is really difficult to determine the moment when to buy cryptocurrency and when to sell it. However, you can always try to make your cryptocurrency transactions with the greatest profit for yourself. Choose your cryptocurrency trading strategy. After that, you have to choose a reputable and proven platform for buying and selling your cryptocurrency. Personally, I can recommend you the crypto exchanger trustchange, which takes the lowest fees for its services. Before buying, study the characteristics and nuances of your preferred cryptocurrencies. From time to time, carefully check the price fluctuations.