This volume, Media and Information Literacy in the Post-Factual Era I, brings together English-language contributions presented at the international scientific conference MEDIG 2025. The collected studies address current challenges arising from the transformation of the media and information environment, including misinformation and disinformation, declining trust in information, artificial intelligence, critical thinking, and media and information literacy. Drawing on diverse theoretical, empirical, and methodological approaches, the contributions examine these issues across different cultural, educational, and social contexts. The volume's interdisciplinary character reflects the conference's broad thematic scope and the participation of researchers from Europe, Africa, and South America. The proceedings aim to contribute to contemporary academic debate on the post-factual condition and to support further research and international cooperation in strengthening media and information literacy and critical engagement with information in contemporary society.