Bachelor's thesis starts off with basic explanation how the stock markets work from both investor's and issuer's point of view. Paper brings closer look on Czech and also on 3 world's major stock markets. It also shows existing theories of investing, risks of investing and more detaily explains fundamental, technological and psychological analysis. The object of this work is author's suggestions that moves the theories from theoretical area into practical use and looks for optimal entry and exit into and from stock market. The bachelor's thesis is revolving around psychological analysis and method of Investment clock and elaborate them into more detail to enable investors determinate more precisely when to buy and when to sell the stoce