This document discusses investment strategies. It introduces investment strategies as sets of rules or procedures that guide an investor's selection of an investment portfolio, balancing risk and return. Common strategies include passive strategies that minimize costs, and active strategies like market timing that aim to maximize returns. One well-known strategy is buy and hold, a long-term approach based on equity markets providing good returns despite volatility, with the view that market timing is difficult and it is better to simply invest for the long run.