Equity mutual funds invest in stocks and are classified by market capitalization, investment style, sector/theme, and tax treatment. Large cap funds invest in top companies, while mid and small cap funds involve higher risk but also higher potential returns. Funds are also classified as active, index, sector, thematic, or international based on their investment approach. Choosing the right type of equity fund depends on an investor's goals, risk tolerance, and time horizon. Regular investment, portfolio diversification, and periodic review can help investors achieve superior long-term returns from equity mutual funds.