Best communications presented at the 106th National Congress
These issues of Il Nuovo Cimento are dedicated to a selection of communications given at the 106th National Congress of the Italian Physical Society, held on line on 14-18 September 2020. The National Congress is a good occasion to present research works of different fields and their rapid publication in this volume of Il Nuovo Cimento is very valuable for the physics community also at international level. Issue 2-3 is dedicated to the sections: Nuclear and Subnuclear Physics; Astrophysics. Issue 4-5 is dedicated to the sections: Solid-State Physics; Geophysics and Physics of the Environment; Biophysics and Medical Physics; Applied physics, Accelerators and Cultural Heritage; Physics Education and History of Physics.