I want you to explain all these strategies and why should I buy a stock with explanation. give me some examples.

• Buy and hold, Diversification strategy.
• Short-term trading strategy: For implementing this strategy correctly you must be updated on stock on daily basis and must buy the stock at least at three different dates) You must also write 2 lines of justification for each purchase you make).
• Penny stock strategy For implementing this strategy correctly you must be updated on stock on daily basis and must buy the stock at least at three different dates) You must also write 2 lines of justification for each purchase you make)
• Fair value (intrinsic value) strategy (Chapter 4) .