This workshop will give a broad overview of important fundamental concepts for molecular and materials modelling on HPC, with a focus on three of the most modern codes for electronic structure calculations (QUANTUM ESPRESSO, SIESTA and Yambo). Participants will put their new knowledge to the test on the Leonardo EuroHPC JU supercomputer (https://leonardo-supercomputer.cineca.eu/hpc-system/) with theory sections and practical demonstrations and hands-on exercises.