World War I, which lasted from 1914 to 1918, left a profound impact on the world. The consequences are not only felt in political, social and economic aspects, but also teach us valuable lessons that are relevant today. The first significant consequence was a change in the world political map. Great empires such as the Austro-Hungarian and Ottoman Empires collapsed, while new states emerged. These changes created instability in Europe and the Middle East. For example, the creation of national states in former imperial territories often ignored existing ethnic and cultural boundaries, thus triggering future protracted conflicts, such as the Yugoslav Civil War in the 1990s. From a social perspective, World War I accelerated changes in the role of women in society. Many women left the home to work in factories and as nurses, and after the war, demands for voting rights became stronger. This was the first step towards the gender equality that we see in many modern societies today. From an economic point of view, the war resulted in a deep crisis. Many countries were trapped in huge debts to finance the war, creating poor economic conditions after the war ended. Inflation and unemployment rose, leading to the rise of extreme ideologies in Europe, including fascism and communism. The lesson to be learned here is the importance of economic stability and the negative impact of large debts on the fate of a nation. Learning from this war, the world also realized the importance of diplomacy and international agreements. The League of Nations, founded after the war, became the first example of a global collective effort to prevent large-scale conflict. Although not completely successful, this basic idea can be seen in modern organizations such as the United Nations (UN). World War I also taught us the importance of communication. Many misunderstandings between countries in conflict are made possible by a lack of effective communication. The current era of information technology reminds us of the importance of open dialogue to prevent conflict. The cultural aspects of World War I are also apparent. The artistic and literary activities that emerged in response to the atrocities of war show how war influenced the way people thought and created art. Five years after the war, many writers described the trauma and grief experienced, helping people to understand the emotional consequences of war. World War I therefore served as a reminder of the dangers of extreme nationalism and the importance of international cooperation. By studying the consequences and lessons of this conflict, we hope to be wiser in dealing with global problems and building a more peaceful future. War and violence are not solutions, but collective efforts for dialogue and better understanding are steps towards a more stable world.