Sizing the circuits
Every new circuit gets sized to the actual load. EV charger circuits are 50A or 60A on 6 AWG copper. Range circuits are 50A. Dryer circuits are 30A. General-purpose receptacles are 20A on 12 AWG. Lighting is typically 15A on 14 AWG. We confirm the load and protect with the right breaker, not "whatever was already in the panel."