Day trading is a strategy where an investor buys and sells securities on the same trading day. This can be a high-risk, high-reward strategy, and it requires discipline, research, and a solid understanding of the market. Here are some popular day trading strategies:

1. Scalping: This is a strategy where an investor buys and sells securities within a few minutes or seconds, in order to profit from small price movements. Scalpers use technical indicators and chart patterns to make quick trades and exit the market as soon as they make a profit.
2. Breakout trading: This strategy involves identifying key levels of support and resistance and then buying or selling when the price breaks through these levels. This can be done by analyzing historical price data and identifying patterns.
3. Trend following: This strategy involves identifying the direction of a market trend and then buying or selling in the same direction. This can be done by analyzing historical price data and identifying patterns, as well as using technical indicators such as moving averages and the Relative Strength Index (RSI).
4. Mean reversion: This strategy involves identifying when the price of a security deviates from its average price and then buying or selling in anticipation of the price returning to its average. This can be done by analyzing historical price data and identifying patterns, as well as using technical indicators such as the Bollinger Bands.
5. Contrarian trading: This strategy involves taking a position that is opposite to the current market trend. It involves identifying market sentiment and the positioning of other traders and then taking the opposite position.

It’s important to note that day trading is a high-risk strategy and it’s not suitable for everyone. It requires discipline, research, and a solid understanding of the market. Before engaging in day trading, it’s important to educate yourself, understand the risks and have a well-crafted plan.