Building a solid foundation in international relations for the UPSC syllabus involves focusing on key concepts, historical events, and contemporary issues. To start, students should review foundational theories of international relations, including realism, liberalism, and constructivism. Staying updated on current global events through credible news outlets and journals is essential. Utilizing NCERT books and standard reference texts helps in mastering crucial frameworks. Engaging in discussions on international policies and attending lectures or seminars can also provide practical insights into the dynamics of international relations, crucial for UPSC success.