Nuclear physics is yet another fascinating wing of physics. The fundamentals of nuclear physics include radioactivity.
If you want to learn more:
https://en.wikipedia.org/wiki/Neutrino - neutinos
https://www.britannica.com/science/radioactivity - radioactivity
https://www.space.com/four-fundamental-forces.html - 4 fundamental forces of the universe ( Gravity, Strong interaction, weak force and electromagnetic force)
Questions
What are antineutrinos in detail? What makes them different from neutrinos?