Always use the right tool for the job.
In general, a shotgun is excellent for home defense against just a couple of home invaders. Less over-penetration and chance of involving your neighbors... while properly sending the bad guys to face their eternal reward.
For actions against an invading force... Buy what you can afford to shoot accurately and use in your AO. If a .30 cal variant, be it a 7.62x39 or .300 Blackout, sounds good to you... go for it. A .223/5.56 will also get the job done and is generally lighter and marginally cheaper.
Also... consider your pistol options as well. Smaller armaments like this can help with “sudden Jihad syndrome” and other pop-up predators.
There are as many articles and opinions as there are people to give them. Find what works for YOU and your budget... but find SOMETHING.
Worrying about it when they kick in your door is FAR too late...
Yep. Practice dry runs (with empty weapons) securing your house. Some of us have children and have to do retreival drills. Practice commo plans with the family. Ours is basically: me grab the guns, wife gets on phone and tells 911 what I look like (fat naked high and tight 50 year old with suppressed AR 15/ shotty with blood splatters all over him and hot librarian looking wife with Wilson Combat AR15 providing overwatch) so I don't get shot by responding young adrenalin junkie officers on night shift.
Also, practice clearing home at night with and without flashlight. That chair you sat in earlier before going to bed, could it hide a 120lbs meth head or gang banger?
Gotta practice and go over it with family. Oh....and put the shades down before you do or else neighbors could freak out.
A buddy of mine described an agreement between him and his good neighbor. If someone was breaking into their house at night, their first call was to the neighbor to shoot the perpetrators from the bedroom window across the street while they were trying to get through the reinforced front door.
Surprise!
Pistols put holes in your adversary ,rifles put holes through them shotguns with the right load at the right distance will tear chunks of meat off & drop it on the floor.