Whether you are a day trader or you trade once in a while, you have to align yourself with the smart money, not the dumb money, surf along side the whales,not against them, trading is war and you have to choose your battles correctly
For some people all they do is to keep buying no matter what, even if the market drops to a very low price they will still continue to buy and buy till when the price goes up. But not everyone can do that, its only those that have money that can be doing such a thing. For traders who dont have much money, you will have to calculate yourself carefully before taking any move.