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What are the primary investment strategies people use and why do they use them?
Your question seems to be making assumptions around “investing”, that investing is only about stock market and bonds or similar things. I would suggest that you should look much broader than that in terms of your investments. Investment Types Your should consider (and include) some or all of the following for your investments, depending on your age, your attitude towards risk, the number of dependents you have, your lifestyle, etc. I love @Blackjack’s explanation of diversification into other asset classes producing a lower risk portfolio. Excellent! All the above need to be considered in this spread of risk, depending as I said earlier on your age, your attitude towards risk, the number of dependents you have, your lifestyle, etc. Stock Market Investment I’ll focus most of the rest of my post on the stock markets, as that is where my main experience lies. But the comments are applicable to a greater or lesser extent to other types of investing. We then come to how engaged you want to be with your investments. Two general management styles are passive investment management versus active investment management. @Blackjack says  That pretty much sums up passive management. The idea is to buy ETFs   across asset classes and just leave them. The difficulty with this idea is that profitability is very dependent upon when the stocks are purchased and when they are sold. This is why active investing should be considered as a viable alternative to passive investment.  I don’t have access to a very long time frame of stock market data, but I do have 30 or so years of FTSE data, so let’s say that we invest £100,000 for 10 years by buying an ETF in the FTSE100 index. I know this isn't de-risking across a number of asset classes by purchasing a number of different EFTs, but the logic still applies, if you will bear with me. Passive Investing I have chosen my example dates of best 10 years and worst 10 years as specific dates that demonstrate my point that active investing will (usually) out-perform passive investing. From a passive investing point of view, here is a graph of the FTSE with two purchase dates chosen (for maximum effect), to show the best and worst return you could receive. Note this ignores brokerage and other fees. In these time frames of data I have …   These are contrived dates to illustrate the point, on how ineffective passive investing can be, depending if there is a bear/bull market and where you buy in the cycle.  One obviously wouldn’t buy all their stocks in one tranche, but I’m just trying to illustrate the point. Active Investing Let’s consider now active investing. I use the following rules for selling and buying:- This is obviously a very simple technical trading system and I would not recommend using it to trade with, as it is overly simplistic and there are some flaws and inefficiencies in it. So, in my simulation,  These beat the passive stock market profit for their respective dates. Summary Passive stock market investing is dependent upon the entry and exit prices on the dates the transactions are made and will trade regardless of market cycles. Active stock market trading or investing engages with the market using a set of criteria, which can change over time, but allows one’s investments to be in or out of the market at any point in time. My time frames were arbitrary, but with the logic applied (which is a very simple technical trading methodology), I would suggest that any 10 year time frame active investing would beat passive investing.