Sell
If try to sell before check the price in the market place. If price is high then sell it. It time to change the price. So time to complete the process. Most the people check the price the it will be sell. So you learn the selling process. Time to connect the trad and complete the process.
Hold
You hold the coin if price will be low and hold the long time. If hold the coin long time you get more profit. So if want to sell before check the price then sell.
Buy
If want to buy check the price in the market place and check the best coin list. Then buy and buy it. People learn more information from market place. Market place is connect all country business for the improve the business and reach to all country. Trading is important for this process. Buy the coin and hold wait for the price increase.