The HellasQCI training program is a comprehensive initiative targeting academia and research institutions, security and IT experts, as well as end users and public authorities. For graduate students in quantum technologies and classical communications, the program offers hands-on workshops and tutorials with a specific focus on Quantum Key Distribution (QKD) systems, emphasizing practical experience in generation, manipulation, and single-photon detection. Security and IT professionals will receive training on cryptographic principles, both asymmetric and symmetric systems, exploring their security against conventional and quantum computers. The curriculum also covers the implementation of QKD protocols, threat models, and quantum secure encryption methods, integrating them into symmetric cryptographic infrastructures. Meanwhile, end users and public authorities will gain insights into quantum communication and cryptography concepts, with a special emphasis on infrastructure design for governmental and commercial testbeds, as well as strategies for integrating QKD resources into diverse settings and varying photon noise levels.