The talk likely begins by introducing the relativistic nucleon-nucleon potential. This potential describes the interaction between nucleons (protons and neutrons) in a relativistic framework, accounting for relativistic effects through meson interaction. The application of this potential is then discussed in the context of nuclear structure and reaction studies. The talk concludes by discussing how the findings from neutron stars and binary mergers help establish nuclear matter constraints for finite nuclei at local density. This step is essential for connecting astrophysical observations with laboratory experiments, creating a comprehensive understanding of nuclear matter behaviour and its significance in astrophysics. Additionally, it contributes to our understanding of heavy element synthesis and gravitational wave signals.