Whatever happens on a stock exchange and no matter how much influence computers, algorithms and high frequency trading may have, human nature will always have an important role to play. Typically, human nature becomes more important when momentum is changing and there is excitement or panic in the air. It would seem wise to try and understand this mass psychology or group thinking which is often referred to by investors as the madness of crowds.
Investment ideas can come from many places. Ask your family members what products and services they are most interested in—and why. Look at trends in the world and companies that are in a position to benefit from them. Stroll the aisles of your grocery store with an eye for what is emerging. You can also seek guidance from professional research services such as Standard & Poor's and ValueLine. Many online sources also exist for investment ideas.
By understanding your risk tolerance, you can avoid those investments which are likely to make you anxious. Generally speaking, you should never own an asset which keeps you from sleeping in the night. Anxiety stimulates fear which triggers emotional responses (rather than logical responses) to the stressor. During periods of financial uncertainty, the investor who can retain a cool head and follows an analytical decision process invariably comes out ahead.