View videos on Tactical or Fighting Shotgun.
Practice those drills.
You can also attend those courses.
I like the 12 gauge for home defense. I also have other tools such as handguns and the AK47. Those tools cover all practical and foreseeable HD situations.
2A: "A well regulated militia, being necessary to the security of a free state, the right of the people to keep and bear arms, shall not be infringed." US Army Combat Veteran and Paratrooper: OIF (2008, 2009, 2010) and OND (2011). Bronze Star Medal and Meritorious Service Medal recipient. SAF and NRA Lifetime Member. I'm a lawyer, but not YOUR lawyer and I have not offered you legal advice.