Growth stocks can be a valuable addition to any long-term investor's portfolio.The power of compounding is a long-term phenomenon. A long-term mindset means you're investing for decades (e.g., retirement, major life goals), not months or the next quarter. This naturally smooths out the impact of short-term market fluctuations.This mindset is incredibly important if you want to invest and stay invested in the stock market for years, and it can also help you ride out the natural ups and downs of various marke ...