I wish it was that easy but it definetely isn't that easy. Trading is way more complex than this. You have know how to read the charts and trends and you need to know how to analyze the market as whole. If you don't do this and buy a coin from a point which you think is the dip you can end up by losing half of your money because the real was just waiting for you at the bottom. Therefor never blindly buy or sell a coin.