1. If you wanna buy a coin/token in any exchange than you should join that projects social groups and channels for getting update info about that coin/token. Which will help you to take the decision when to buy, hold and sell. Most of the crypto project have a continious upgradation plan. whenever any date comes near basically at that time investors try to buy that coin/token. So its really important for you to remind all the important dates of that projects to make healthier profits.
Trust in this strategy is very dangerous, because if you are late, you will buy at the top and everyone will sell and you will be at a loss. The person never knows what the big price increase will be. And there is the case that many altcoins are listed in shady exchange and if the person follow this group and hear that altcoin X is going to have a big pump but that same altcoin is listed only in the shady exchanges and that person decides to go and deposit their currencies in the shady exchange , then the person may run the risk of losing all their coins.