Fear of the unknown, high interest rates and periods of high inflation are undoubtedly the main causes of people's low interest in the stock market. The method of analyzing investments in shares, based on explanations by various authors, as well as the results of this study, have made it possible to verify that investments in shares require evaluation and analysis. In this sense, the fundamentalist theory and technical analysis are addressed, covering their concepts in order to act in the financial market considering the theoretical basis.