This thesis examines the relationship between financial literacy, digital tools, and investment behavior, aiming to understand how knowledge and technology influence rational financial decision-making. The study is structured around two main hypotheses: first, that financial literacy/education positively correlates with rational investment decisions, and second, that digital financial tools enhance literacy but may also increase risk exposure for certain users. The first part of the thesis focuses on financial literacy and its role in enabling informed investment choices. It highlights the growing complexity of financial markets and the increasing need for individuals to understand interest rates, inflation, and risk diversification. A key case study is Lusardi & Mitchell (2014), which demonstrates empirically that individuals with higher financial literacy make more rational decisions, supporting the first hypothesis.