The four fundamental forces in nature, as currently understood, are:
Gravity: It is the force responsible for the attraction between objects with mass. Gravity is the dominant force on cosmological scales, governing the motion of planets, stars, galaxies, and the expansion of the universe. It is not known whether gravity is conserved or not on a fundamental level, as our current understanding of gravity is described by Einstein's general theory of relativity, which does not easily fit into the framework of quantum mechanics.
Electromagnetism: It encompasses both electricity and magnetism. It is responsible for the interactions between charged particles. Electromagnetism is mediated by photons and is described by the theory of quantum electrodynamics (QED). The laws of electromagnetism are believed to be fully consistent with the principle of conservation of electric charge.
Strong Nuclear Force: Also known as the strong interaction or strong force, it binds protons and neutrons together within atomic nuclei and is responsible for the stability of atomic nuclei. The strong force is mediated by particles called gluons and is described by the theory of quantum chromodynamics (QCD). The strong force is associated with a property called color charge, and the conservation of color charge is a fundamental aspect of the strong nuclear force.
Weak Nuclear Force: It is responsible for certain types of radioactive decay and processes involving subatomic particles. The weak force is mediated by particles called W and Z bosons and is described by the electroweak theory, which unifies the weak force with electromagnetism. The weak force violates a property called parity, which means it does not conserve left-right symmetry.
Regarding the conservation of these forces, some of them are conserved, while others are not conserved on certain levels.
Conserved: Electric charge is conserved, meaning the total electric charge in a closed system remains constant. Similarly, color charge (associated with the strong force) is conserved.
Not Conserved: Parity is not conserved by the weak force. This means that certain weak interactions violate left-right symmetry. Additionally, in the context of gravity, it is still an open question whether gravity is conserved or not on a fundamental level, as mentioned earlier.
It's important to note that our understanding of these forces and their conservation properties may evolve as scientific research progresses, and new discoveries are made.