I disagree emphatically. For someone just getting into shooting, a shotgun is the worst possible introduction due to its intimidating recoil.
It's much better to develop good skills with a minimum of flinch and fear, then move into larger firearms such as the double-barrel shotgun.
When I teach complete newcomers, I use the .22 pistol exclusively.
Well there is something to say for that ...but
1. A tyro with a shotgun will get a hit at close range. Not so with a pistol
2. Regardless of whether it hits, a shotgun will intimidate the hell out of anyone.
3. A light load in a shotgun for reduced kick will be lethal or incapacitating.
Moreover you can easily make non-lethal loads (I know, I was once shot with rock salt when I was a kid).
4. A shotgun, particularly a break action one, is a safer weapon than a handgun.