A good resource starts with basic quark model assignments and progresses to complex loop calculations.
Most particle interactions occur at speeds near the speed of light. Problems often focus on four-momentum conservation, invariant mass calculations, and threshold energies for particle production. The Standard Model particle physics problems and solutions pdf
Understanding how energy, momentum, charge, and lepton number are conserved in decays. A good resource starts with basic quark model
3. What to Look for in a "Particle Physics Problems and Solutions PDF" invariant mass calculations