If there's a stock with a good price, it's worth buying. Even if it decreases in the short run, trust the research you've done to produce long-term gains. But don't ignore the company entirely. Consistently check your investment thesis to make sure it's still valid.
Day trading is when you buy and sell stocks on the same day without regard for the underlying fundamentals of a company. Both can be profitable, but it's very difficult to become a profitable day trader. It's much easier to become a good investor.






