Is it possible to connect two breakers in one panel board

What he said is correct That is 2 circuits that take up one breaker slot Each circuit requires its own neutral Something you need to look

A tandem circuit breaker connects two independent 120V circuits, both necessarily on the same leg since it's a single slot in the load center A dual pole

two breakers in one slot Each slot on a breaker panel can hold one, single-pole 120 volt circuit A 220 volt circuit will be double-pole and take up two slots Tandem circuit breakers

two slot shelving Double-pole breakers have two hot wires that are connected by a single neutral wire That means if there's a short circuit on either of the